Mopar 340 j heads He told me a set of Edelbrocks will flow more out of the box then my J heads would ported. Jan 30, 2017 #5 stixx said: EQ heads are flowing better OOTB than any X or J-head. both 915 castings with 2. The Magnum heads are on the MoPar create engines. 53 13% off. 02 valves, The J had the 1. You will need to have your valve springs or any new springs that you buy checked for symmetry. The heads aren't all that rare and the same as J heads. Similar to the '71/2 360 and '72 340 heads. You may get some helpful hints there, january 2000 issue fro the intake and february for the exhaust. I bought it minus the heads. These heads have unusual markings. # 3418915, 65cc 72 Cast. 3418915 with a 1. 030, has federal mogul pistons (#7035p) 13. In my 360's, I like to zero deck the pistons and run a . What is the stock plug number for a 340? 71 10. 88 for 360 or a 2. Not even close to a dog. Not a big deal. The only difference is manufacturing variations. 02 intakes. 88" valve is 1972 340 and 1971+2 360, J head. This is a VERY NICE SET and has been professionally cleaned, shot blasted, magnafluxed and verified to have no cracks or damage. also there are J heads for 340 from the factory, and for 360 from the factory. Now upgraded to 2. 6 exhaust. Opens in a new window or tab. Yes the X heads are good heads, better than the J heads, but there are aftermarket heads that are better if you're willing to Yes. Some references say the 915s were 72-up 340 and 360 1. Find top brands, exclusive offers, and unbeatable prices on eBay. Thread Tools: Display Modes #1 03-28-2004, 07:16 PM moparots. Part Number: TFS-61494080-040 The J heads are 360 heads and the X are 340 heads. 88 intake & 1. burnt orange black int with buckets,. 02 valves - for only that year. Some Mopar Engines were designed for drag racing. i have a 71 340 motor for sale. 02 valve J heads with those (3418915) casting numbers. No difference unless it has the offset pushrod holes, then you are talking T/A or AAR pieces. its called cost cutting. I've got a 318 block that I'm thinking about building, and I also have a set of 340 J heads with the 2. T/A heads--and indeed, all 1970-'72 340 and 1971-'72 360 heads--are some variation of the 3418915 "J" head (the last alphabetic digit is meaningless) but not all J heads are T/A heads. We look at the dampened valve sprin These heads are the best flowing heads next to the w-2 heads mopar produced in the 70's. 2cc domed 318 piston. Looking for casting numbers for a Mopar V8 cylinder head or engine block? It's probably listed in this guide, covering 1958-1993 production dates. No idea if heads are original to it and I've never had them off to look at them. Wanting to bump the compression up, Brian chose a set of Diamond pistons with a 6cc dome, which, combined with the 63cc combustion chamber and Cometic MLS head gaskets with a 0. com. If you're going for an accurate restoration, these things are a must have. The stock 1. 02" intake valves and the only way to tell is to take the heads off and measure them. Please Contact. Casting #3671587, listed for 1973 340. 080 in. Casting dates can provide more clues. the caps kept kicking out, plus valves had to be relashed after a I agree with the Alaskan. Clean bill of health from Barker Machine in Mopar puts these heads in the 13 - 10 second power range. Comparing LA cylinder head flow numbers. There is a J cast into the deck facing surface, and up top, where the J usually is, there is a II cast. Ok, here is the info I have on 340 heads, I hope that it is accurate, but if not, I'm sure someone can correct it. # 2531894, 63cc 70T/A Cast. X Heads vs J Heads all open chamber 340/360 heads right up to the mid 80's 308 head have the same chamber and port design. runs of the Js had the 2. This gives an excellent pump gas ratio (on or about 11-1 depending on exact piston deck height and final head cc from milling) that works well with medium to large cams. Because the exhaust port shape and bolt pattern. 02& 1. 88 depending on the block casting. 360 with 340 TA heads. 60 inch valves, and have "open" chambers with volumes of 65-73 cc. 340 heads have a larger intake valve with a 2. 02 valves, upgraded valve springs, and these heads come factory with Hardened seats. Has stock manifolds, 2. 5 DNA® Aluminum Roller Rocker Arms Set View attachment 1716039476. Mopar did this until 72 when they standardized 340/360 heads for cost saving reasons. and the guys working in the foundry did not worry about perfect Comparing LA cylinder head flow numbers. $800. 010 @ 59. 340 J Head Combustion Chamber. We look at the 1. I used "72" 340 "J" heads with 1. These heads are all castings ending in 915. 360 j head valve stem diameter? that are machined for them. Inactive User Hey guys, I have the chance to guy a set of 340 "J" heads from a freind. 88" Intakes are sitting low in the Valve-Seat, then an upgrade to 2. And they are peanut plugs aka small socket plugs. The J heads came on 340's and 360's but with hardened seats and 1. List price: $1,119. But be warned that by the time you refurbished the head it will cost about the price of an aluminum head with less performance potential. Brand New. 040 in. Not a tire shredder, but spirited, fun to drive. 4, and magnum heads shave . Any help with these questions would be great. 1-1 compression and a pretty agressive cam behind it. yall I hope can still buy. 88. casting dates are cast on the top of the intake port near a valve spring, abbreviated month day year, hard to see in the pics. 02 intake valve sizing O head is According to Carroll Shelby's Speed Secrets (Mopar Engine) the head with casting #3418915 was used on the 70 340 6 barrell T/A, 71 360 and 72 340/360. Available in 350 cubic-inch So if you go by this chart what 2. 9 engines so the flow is there. You can buy them bare if you would prefer to use your factory valves and springs. 88I 110 165 190 190 185 1. 5 360 "U"-#915 w/2. 02 heads did 1971 340/275 Hi Compression 4bbl motors have? Back to these-3418915C 2990 AAWJ 3418915-C - if you look at the chart below the only 2. $973. Hello sk; Starting in 1973 the government reduced the lead content in gasoline, with this catalytic converters were comming and lead is a "poison" to the cat's( actually attaches to platiunm sites on the substrate negating it's effectiveness ). X you are going in the right direction,magnum heads have nice flow numbers But, also fair warning,99% of magnum heads are cracked,between the seats. 97 119 126 129 131 Early W-2 w/Prod. shark tooth grillwith 340X cast in the side of the block,. We compared bare heads, and there was absolutely no difference except the valve size. 02 intake & 1. 6 rockers to give a little extra lift to my current cam since I’ll be updating to speedmaster heads, 2. The J/U's actually U's cut off on some were 2. Less than 500miles on them after complete rebuild. 02 J headed 340. Further, let me add that small block heads interchange, with just a few small details including early 273 heads having different intake bolt hole angles, 2. The vast majority of them are not. The Z was found on 1970 340's and were all 2. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search Departments; Brands; Savings Central Im going to look at a pair of "bare" 340 X heads on Tuesday 4/9/19. Get the best deals on Mopar Cylinder Heads & Parts for 340 when you shop the largest online selection at eBay. 3rd The j heads DO have minor differences over the span of production, like the smog heads have a lil less int ssr/floor hump, the smog heads do have floor bumps/air injection bosses with i have T/A heads on my cuda, and they have J's on them. 066” farther apart than in most Mopar heads, and this allows more room for larger valves. Part Number: EDL-60769. 02 vaulves j or x heads that are way more exspensive. Some say Js came from the factory with 2. 010 milled off @ 71cc, 1990 302 heads milled . 60 valves installed. Thread starter heads on the motor are not the originals, the car came with an extra set. Tune in for more details and photos only in Mopar Muscle Magazine. 02 wth the 340. Mopar Muscle Magazine FYI, the Performer RPM is the same internally as the Performer RPM Air-Gap. 02" Intakes, unless you're pounding in the 5000 Here is some flow data on some heads I had around 10 years ago: Head ID /Valve Lift> . 02's and 1. 88 intake and 1. They are 915 J heads. The heads bolted to the motor are both (360) J Heads, casting number 3418915, AAWJ. Released in 1958, they existed until 1978. The 302 has a slight advantage and thus is the reason MP used that head for there performance ported 318 head. But > if the current 1. 02 valve 915 was the T/A So the date code 2990 comes out as Saturday - 10/4/1970 That would make it a '71' car cyl head The AAWJ and the cast "J" by the plug hole confirm - J The X head had the 2. 02 intake valves of course and new double springs as well as 'The Old Adage > 1. I've personally cc'd and documented 1971 915 heads with . 2 (318) and 5. $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: LASTCALL. 2. A 340/360 head. Part Number Description ; TFS-61417801-C00: Trick Flow PowerPort 190 Cylinder Heads: EDL-60779: Edelbrock Performer RPM Cylinder Heads: TFS-92030: Trick Flow Cylinder Head Bolt Kit: This is a shot of the Car Craft 340 Swinger that back in 2014 Jim Shepard of Edwardsville, Illinois purchased and restored. Brian Hood Well-Known Member. 8; Next. 5 exhaust. In this case a 2. just food for thought. Topped off with "71" 340 intake, TQ and the "72" 340 cam. 6L/340 Mopar small block LA Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1000 - Use Promo Code: CYBER. Another 70 swinger 340 with X's on it, October Head Gasket, Multi-Later Steel, MLS, 4. Pre-Owned. 02s but a 3671587 Cylinder heads– 1973-1974, 360 J LA-series small-block, originally 1. The biggest difference I have seen between X and J heads, is about $300 a pair! LOL. 02 valved J heads on 1970 340 cars, because i had such a car, and its far from a oddity for this to be the case. In 70 the 340 TA head is casting 915 and that was the only thing that used the 915 casting. Has a stock 904 with a 8. It says it wasn't until 72 that the 340 got the 915 head. 340 block-going to remove 302 heads and install j heads. These were either equipped with 1. Bore, . 88-inch intake (360) is also popular. These are something even less For 1971 and 1972, 340 and 360 engines were equipped with 3418915 heads, so-called "J" heads, because of the cast-in J in three locations (backwards in one place) on each head. 88 "J" heads. 02 will be better than a 1. They also come with a very efficeint head design that has dual quench, a nice advantage All J heads use the same casting; the T/A heads require special intake rocker arms not used on any other cylinder head. The real question is how far bolting open chamber heads on your 318 is going to lower your compression. 02's. i never got the specs on exactly what it is, but i am looking to ditch the 360 cast heads i have and want a good set of aluminum heads for mine. decided to just spice up the 340 seeing doing the 440 swap was going to be too much right now. I have a set of 587s off of a 72 340 that have a J cast on the underside but just what looks like II by the plugs. 00 to 1000. 60's. 88 and I am looking to try and find the combustion chamber size for 188 160 valve 340 J heads. food for thought, when going from what are the flow numbers of stock iron heads, I see aluminum heads are about 66-67cc and about 170cfm trying to compare that to the iron heads. 02 or 1. I've picked up complete pairs O, J and sometimes Depending on your eventual goals, RHS and edelbrock heads are available in magnum configuration. 60. as my 340 stock have. Sell one and buy the other. You'll be right around 375 hp. I Have gotten 268cfm@28" out of X heads with 2. Eddy Victor 340 intake worked on my IMM Pac 1903 springsCrane 1. 88 valve head on a 1971 340 period. What is the sequence for removing the head bolts? 340 block-going to remove 302 heads and install j heads. but i know what i had!! wish i still had it to! like i said,. I can get a set - - - Updated - - - and Yes the J heads do offer an improvement over stock 360 heads ESPECIALLY over the smog heads NON-swirl, biggest difference is the smoother softer radius, leading into the Valve pocket (intake) and a cleaner radius out of pocket on exhaust, there is also a difference in the floor and side walls of runners both on intake are those J-heads 1971 340 heads with a date code of 1970 or 1972 340 heads with a date code of 1971? If date code of 1971 I would check the size of the valves. The heads that it had on it, which I have no idea if they were original for that block, are 360 J heads which have that cast into them; with Don't get carried away with J or any other small block mopar head you have 318 style and 340 360 style ports and a couple of valve size choices- all obsolete are the guides bronze or just knurled? new seats? what materiel- it does make a difference springs have dampners- that's a clue You are better off finding a set of the "swirl port" heads with the heart A brief description of 894 X heads, and 915 J heads. 60 inch valves. So, Mopar made the 308/576 casting, utilizing 318 swirl port heads are to have the “302” Designation. The 340 valves’ head diameters are the most popular at 2. 02 valves but never made it on the 360s, it was still a 340 head with the 2. simple there is a groove on rocker side about 2 inchces long. 60 valves, 65cc-73cc. High Performance Mopar magazine, 7-1999. Some light porting on intake and exhaust- no break-through or welds. I'll add any flow numbers contributed by a member, but I don't want to take info from someone else's website if they haven't given permission. 88" for 360 applications. 88" Intake Valves sit fine in the Valve-Seat, and this is a Street Car, you won't necessarily gain much HP with the 2. 60 inch valves, or 2. The 340 Mopar Engine is still one of the most popular Mopar Engines from the ’60s and ’70s. These heads came with either the 1. Casting dates are 12/04/1967 and 12/05/1967. so a larger valve can be be fitted. # 3418915, 65cc 73 Cast. As Mike pointed out, 915 heads were also used on 340-6 T/A & AAR E-bodies. Buy It Now +C $90. it has been bored over . 340 Build- rocker questions on going with 1. Currently, car is a 73' 340 . Shop now for fast shipping and easy returns! All small block heads use the same valve spacing, so this is true for all LA and Magnum heads. 29 shipping. 88 and 1. . Add a set of stainless 2. Thread starter panthro72; Start date Apr 18, 2012 - P. locks, solid cam. The valves have value being new. Mopar is about parts hoarding LOL!. 0 out of 5 stars. Taking the benefit of the offset rockers effectively out. 360 heads on a 318 LA. I'd say 200-250 max if std 340 heads. My matching numbers 70 340 Duster (B3) had 54000 miles on it when i got it. 200 . 6-61. Yes, from what I read the 74 360 4-barrel HP got the 340 good stuff- cam,intake,J heads not sure if there Click here to search for Mopar cars and parts for sale. You are buying a pair of Mopar 340 or 360 3418915 J Casting Cylinder Head Castings. The RPM manifolds are the stock J head 340/360 port size and will perform better overall especially since you are upping the cam timing. 02 inch x heads, but they are J heads on a 68 block. They produce 380 HP according to MoPar, I have seen several dyno tests that peg them at but mostly over 410 HP. 02" Intakes is worth 'every penny' of an investment. 88") and induction hardend valve seats. They all flow about the same reguardless of letter except where the valve is bigger. Guy kept them. 88 valve heads. Its not wrong from my experience. 040-inch compressed Are the combustion chambers the same size between X and J heads? My valve sizes are the same. The results of our flow test are shown in Table 1, Column 1 Small Block Mopar Engine . At some point, later heads had them When did the J heads get the 2. Chance that it has 2. rockers sit on a shaft and have an adjuster on the rear Often you can get J heads for $100 per set and then have them rebuilt and will work VERY well with any SB Mopar. 1989-93 587 340/360 1973-74; 1976 596 318/360 1977-83 915 340/360 1970-72 974 360 1975-76 994 MP W2 Econo As with anything made by the factory, it's important to keep in mind that factory tolerances are not The J heads ports are identical to the X heads - the only real difference is that most of them have smaller intake valves (1. Understand, I'm no naysayer. (360 blocks started to Head Diameter. Some '73 "J" heads are 360-2/360-4/340 heads used from '73-5 at least. or Best So i have a 1973 Duster that was originaly a 340 4-speed. i think it's just the way the castings came out. I Edelbrock 60775 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. 88 for 360 and 2. Free shipping on many items | Browse your favorite brands | affordable prices. car slowed down . 02 and 1. panthro72 Member. in 72, all were 1. Heads were cleaned and magnifluxed. 070 bore. My AAR 340+6 came with 'J' heads, 2. It takes a long time ant sayin yall wrong,. All others should be a 1. 02 is best. 72-73 340 had J heads with . I have a 71 casting date 340 mopar engine with X heads steel crank have aluminum intake and cast intakes!! have 300 parts cars so ask any questions!!! phone or text 204 638 1035. A bigger If you want to use stock J heads and only want 350 - 400hp, get a good three Find many great new & used options and get the best deals for Mopar 340 360 J Cylinder There is no need to put larger valves in a set of big valve J-heads. Compressed Thickness, Mopar 318, 340, 360, Each. 5. intake pushrod holes offset, requires offset rocker arms. Rather than destroy these heads, I would like to sell them and put a set of aluminum heads on it. 030 40 years ago as well as a set of ForgedTrue I believe 12. But the simple fact is, unless someone is looking for a factory correct set of early 340 heads, their value is Get the best deals for Mopar 340 J Heads at eBay. 5 rockersMP race electronic distributor with MSD 7-2 I think. Horsepower gains are tough to predict, but you will gain power. THey flow the same, and weight the same. Forums. I wouldn't get too hung up on that letter at the end. Mopar uses the same magnum head for either 5. I have a Comp XE 262 with KB pistons and J heads with 2. 00 for head work, depending What size valve stem diameter do the stock j-heads carry? Is it 5/16 or 3/8? My 915 heads are 1. 02 valves in a . does it increase compression?, does it have bigger intake valves? or something, just general questions. 88 intake valves. The 1. The problem is, I can't find info on what size the combustion chamber should be in these heads. 71 gear all in a 76 Aspen wagon. 08-inch 360 4. 60 exhaust though nothing in the MoPar world is in stone. train parts. C $1,144. They are still 73cc heads with the offset rockers. And yall can continue the conversation from 1973s thread. 1989-93 587 340/360 1973-74; 1976 596 318/360 1977-83 915 340/360 1970-72 974 360 1975-76 994 MP W2 Econo As with anything made by the factory, it's important to keep in mind that factory tolerances are not The "X" heads and the other 2. Heads were modified to add steel O-rings (a High-Perf mod from 'back-in-the-day). 02 intake valves in it? The motor is very original. I will say, the W8 heads are a very There is a large "J" cast into the head between the spark plug hole pairs. The heads were I believe around 1970 340's were 915 w/2. Vintage MOPAR chat: 6: 10-30-2008 03:42 PM: 906 casting heads from a 70 440 HP: spdge70: Rear Wheel Drive - Parts for Sale: 1: 11-17-2007 08:12 PM: 302 casting heads? otanathesamurai: Performance Talk: 6: But according to my "Small Block A Engines" manual from Mopar the 894 X head was used from 68-71 on 340's. Selling a pair of factory 915 J heads 340 or 360 that have been ported. FABO Gold Member. The block is original T/A block, but the heads are mopar performance 340 T/A "replacement" heads. As far as the heads are concerned, they should have a big X cast into them adjacent to the spark plug holes. 60 valves. i am looking to purchase a set of heads for my 340. Never been apart. Comes with Rocker arms,push rods, and head bolts. 88/1. casting date 1/5/70 and 12/11/69. ccs. 88 valves on 1972 model year through 1973 of the 340s. I dunno if my book is wrong or the T/A heads may have just had radically different machining on the same Hi E-body fans! Not my first post here, but I guess my info got deleted and I had to rejoin. 038 head gasket with the Edelbrock RPM heads. I'm gathering parts to build a street 340, 400 HP goal, for my 71 Scamp. Though others have found the earlier heads to be super close and perform equally stock or ported. 60 and 2. For Sale- Nice pair of 915 J-head castings for a 340/360. # 3671587, 65cc ok, that one has me stumped. Sponsored. 68-71 340 2. But no reason that people can't link like they have been, and use the info to compare to Small Block Mopar Engine . 30 over, Speed Pro Forged pistons- L2316F, J heads, Crane Cam 150062- Flat tappet (Crane Cams 150062 Crane Hydraulic Flat Tappet Camshafts Mopar Chrysler SB 318 340 360 Shaft 1. 02 valves, pushrod holes relocated and the adjustable rockers, so Ma Mopar definitely had them out for the 1970 model year. So earlier castings are subject exhaust valve seat sinking. to me u340 heads r as . 3 product ratings - Edelbrock 60779 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. 02 intake valve. as were O's. I thought early 340's were supposed to be x heads? I just aquired this 340 for a project of mine, i was hoping for 2. Joined Jul 26, 2012 Messages 285 Reaction score 139 Location Although J heads are fine, the '576' is an updated design (as far as factory iron small block heads). 65-inch exhaust and 2. 85 116 124 129 133 w/ MP 1. 02 for a 340. 88 or 2. 88" intake valves. 88 inch/1. I just question the port size for I have a 340 bored . It still runs Find many great new & used options and get the best deals for Mopar Dodge Plymouth 340 360 J Heads # 3671587 at the best online prices at eBay! Free shipping for many products! Hi guys, I recently picked up a set of heads at a swap meet that are supposed to be a set of 340 T/A heads. Set of 340 TA Heads No Rockers or shafts. I will say that just bolting on a set of W2 heads Find DODGE 5. Trying to find the right pistons to go with the heads I am going to Home. 88 - 360 head is excellent for mundane to mild performance drivers. The problem with muscle car eras cylinder heads was the short side radius, or the lack of it. It also says that there were three different valve combinations in the heads; 273/318 1. As I understand, J heads can come with both 1. 340 cubic-inch, and 360 cubic-inch variants. Casting number 2531894 - 1968-1970, 340 LA-series small-block, 2. All of the heads recommended are big valve heads supporting a 2. the X head only was used 1968 to 1970. overlap and a narrower LSA, the idle quality will drop some but the there are never any stamped numbers on these heads. hi, In 1971 mopar brought out the 360, they also brought out the J head/915 casting. It is a late 70 340 block. These aren't very special. Anyways, this site is a great bunch I talked to Scott Koffel abought fully porting my J heads for the 340 to 416 stroker assembly I'm mulling over having them do. 60E 90 117 135 140 141. The 308 head was used from the late '80's till the last 360 LA around '92? Don't know what was used through the rest of the '80's. all numbers and letters are raised cast. The 1970 'J-Head' {340 T/A} have the Intake Push-Rod holes 'bored off-set', designed to allow for added Racer Modifications to open up the Intake Ports. 915 heads are 70-72 340/360 and either 1. wow. 1. 050 from the decks, 'every . 02" intakes for 340s while staying with 1. J-Heads. My current set up is 340 . 02 Int. Also as I understand, 1970 340 Challengers came with J He To set the record straight, Mopar did put 2. 60 Thanks Jeff. 02 valves. 1 of 8 Go to page these are not the j heads but all the 340/360 heads water passages are I bought a 340 motor (non TA block) to put in my 1937 dodge truck for drag week, that starts in 3 weeks. Read on our engine buildup as we take a 340 engine replace the hydraulic cams and stock rockers for 340 X heads in our 1970 My 340 has J heads. Not there 340 head. Just looking to put it together finally as just an occasional play toy. Some '70 J heads are 360-2 heads. Comes with 2. Any of the smog era heads are as good as the X heads with 2. 12. i'm just wondering if and what 340 heads change on the 360. These are worth a lot of $$$. Find DODGE 5. Ultra original other than a 4 or 5 year old “ outside” paint on it. 88s while the 71 340s had a different casting. Small Block Mopar Cylinder Head Casting Numbers | Hot Rod Reference Earlier heads had the casting numbers under the valve cover. 88 vs 2. I have done both heads on a 318. I have a 70 340 that is the numbers matching motor for my 70 Challenger A66 car, that has never been apart. Explore a wide range of our Mopar 340 J Heads selection. from United States. 78 intake & 1. 02 as apposed to the ’72-’74 J heads, with 1. 030 over 340. B-Series: The B-series engine is Chrysler’s first official big-block engine. All LA 340-360 heads flow pretty much the same X,J,U,O doesnt matter. How to identify and what year and engine they were used on. Know of others. 02's won't do me any good below 6k and may actually hurt bottom end torque but every Mopar pub I've read says "if ya got 'em, flaunt 'em" WRT 2. 02 J heads, right at 390HP per a superflow 901 dyno. We had a 70 Duster 340 with an X and J head on it, december build. looking for heads for my 340. 02-1. casting number 3418215. 88" vs. 6’s. 60 exhaust MP 590 camshaft. 88's and 1. The 340 was way under rated by Chrysler. 118 166 190 196 193 w/ Prod. 2nd T he exhaust floors of the X heads seem to have more short turn height, or maybe it;s just my eyes. I wounderd what you guys thoughts were on this. What are the differences between 71 340 J heads and 70 X heads? M & J Body Classic Mopar Forum; Other Sites to NHRA lists all this information and it comes from chrysler corp. 30 over with 10. I've been a 10 year lurker and posted a few things in the past, but I can't get back in under my old login. The 72 small blocks had hardened seat and very little performance loss due to the smaller valve. 6L/340 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing Gift Cards - Always the Perfect Gift! Aluminum, Bare, 63cc Chamber, 171cc Intake Runner, Mopar, 318, 340, 360, Each. I don't know anyone in the Danbry are that does heads but I can give you the number of a Mopar guy in Columbia Ct. Otherwise they are just 340 heads. Because the aluminum (Al) heads dissipate heat better, it is possible to bump the CR by ~ a point and not have detonation issues. Why are you thinking only X or J? Could be O,U, or Zs as well depending on year and assembly plant (all 915 castings) only the early 340 came w/ the X (894 casting) 894s 68-70, 915s 70-72, 587s 72-73. BUT I bought them when I was 18 for $500 AUD and got new guides fitted and a performance valve job done on them, I have recently had the The stock Magnum head is an excellent upgrade over the stock older heads. 020” size. They were actually regular late 360 castings, that had the orignal AND the 340 T/A pushrod hole machining so they could be used with the T/A rocker arms. The do Hi, I am building a 1971 340 for my 71 Challenger (not the original engine, this came out of a 340 Duster). Go. I just got the new KB piston catalog, and they list a new 6. you can regulate the height of the valves in the head with the installation of seat inserts. 02" intakes. 6 ferrea 5000 valves in my "915" casting 340 J heads on my 318 quite successfully successfully, so do many other people. i know of a 340, this senario was done on, 7 deg. thanks! Home. This chart will get you in the ballpark. yes the T/A heads are identical to 360 J heads except for, relocated pushrod hole, T/A mechanical rockers, & bannana groove rocker shafts. 02" Intakes If > the current 1. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. 188 intakes all 360s had what would be basically J heads . 4 tenths , i wasn't a happy customer, like rumblefish said i guess due to heat disapation which they say lowers your compression a point I've seen some slightly inconsistent info but I believe they transitioned from 2531894 heads to 3418915 in or around 1970-'71 so certain ones did have 2. Valve size of an X is a 2. New posts New articles New profile posts New article comments Have seen 10-12 k engines come apart because they spent all their money on the lower end, then went to a rebuilder and bought a set of exchange heads. Free ShippingLoading Estimated Ship Date These are the real deal unmolested Mopar X heads off of a 340. 600 360 "J"-#587 w/1. 360 The ratio went to 10. I also wouldn't base my opinion on what a single guy said. 360 & 72-73 340 1. I,ve been consintrating on 2. This video is for new folks to the Mopar sce Some of the 1970 340 Six-Pack engines had heads with a U or O casting letter in addition to the J, but they were still the same part number head (the T/A head had the intake valve pushrod holes drilled in a offset location). 25 rear with 2. Oversize valves, such as 1. A fully ported J head can approach OOTB W2 head but a well ported W2 should go 300+cfm. 88 (for the most), but its very possible some of the 1st. Mike Sealey: T/A engines would be the rare 3x2bbl "340 Six Pack" engines seen only in the Challenger T/A and 'Cuda AAR. The legend has grown on itself as repetitious generations of Mopar no nothings just play back what Uncle Jed said. 88" intake valves or 2. cuda is right , for good performance, expect to spend from 250. 6 65cc port/polish, machine for larger pushrod/clearances to accommodate 1. What's new. 50. 5 compression, purple cam big valve J heads. Fast Shipping | Genuine Edelbrock Part | Made in USA. fwiw, I run J heads on my engine and I truly love them. Thread starter Brian Hood; Start date Jul 18, 2010 - B. 5 or 1. The big port heads are not to terrible to run and drive with. There's also EQ heads which are a very impressive unit. What spark plugs for 340 2. These have other mechanical besides the I run 2. 02 inch/1. any one needs the cut that is on the aar ta shaft it is long on top of shaft. others say they cc at more volume than this up to 72. The valves are spaced 0. 02 heads on a stock 273 is a "oh oh" (bore size), and of course magnum heads will go on the older LA also but some mods will need to be done In short, 318, 340 & 360 LA heads are all interchangeable as far as Best Small Block Mopar Aluminum Heads Overview. It has a J head on 1 side, and a U head on the other. ps, I had a pair of 915 Bet you didn't know such a thing even existed. 02 intake valves. ) Which one is better, 340 X heads or Edelbrock aluminum? had a set of self ported j heads and air gap intake, then switched to a set of stage 1 eddys from hensley and a victor 340 intake nothing else changed. we used to buy the enginequest Iron heads to replace them,much better material and casting. 60 inches for the A-engine. It runs great on the road and around town. 8. Joined Jan 10, 2009 70-71 340 had J heads with 2. If you read the MP A engine book it will tell you those heads came on a 1971 360 engine and 1971 340 came with "X" heads (2531894 casting number), but I have seen engines that I believe to be original that came with big valve "J" heads on a 1971 (or 1972 ) Mopar heads 576 go or bad 0n a 340. Porting small block 915 j-heads. correct for 1970 340 six pack engines in plymouth aar cudas and dodge challenger ta. #11 02-20 This info is correct. Small Block Mopar Engine . 88 and 2. 26-1. 88 valve ,for 360 and 2. 60 Exh. Home. Joined Apr 17, 2012 Messages 21 Reaction score 0 Location watertown Whats to pros and cons of doing this and are the 340 TA heads rare and better or worse then 340 J or x heads. Small Block Head Flow Chart - Discussion Discussion thread. If you want to use stock J heads and only want 350 - 400hp, get a good three angle valve job on the heads, an Edelbrock air gap intake manifold, 750 cfm carb, TTI headers and the stock 340 camshaft! That way you can stay with your stock 340 torque converter. The port contours in the different 340/360 heads are very similar; the X nad some J-heads had the bigger intake valve but since the heads are exhaust handicapped in the first place there may not be a lot of benefit from the bigger intake valve. What is the sequence for removing the head bolts? Also the block is 30 over, so would I need a special order head gasket? M & J Body Classic Mopar Forum; Other Sites to Visit Having done the swap, I put 340/360 heads on "64" 273 . 02/1. 28-1 and with a 63cc aluminum head it is 10. 440, Look at the side of the block underneath the left side heads and post what the casting numbers are, they should end with 340. This IS pump gas ratio land. 2-1, comp XE285HL, roller rockers, stock airgap, 750 DP with 2. 9 (360) Magnum which are prone to cracking issues. I have a set of X heads & a set of J heads, Years ago I tried to port the X heads & ground thru on one port into the push rod cavity. New posts Recent Posts Classifieds Search forums. Mopar Cylinder Heads & Parts for 340 for sale | eBay My 340 has a set of late '72 1. If your's has a july 70 on it, probably an early 1971 motor. In ’71 - after the factory used up the X heads, 340’s received the ‘915’ casing J heads, retaining the 2. X heads came on the 68 - 70 340's with 2. The ’68-’71 340 ‘894’ casting X heads have slightly larger intake valves – 2. 2 or 5. What should I look for as far as problems, I not a engine guy, so I could use some advice. Apparently Chrysler had the "new" head castings available that were going on the new 360 being introduced in the '71 model year. The stock heads provided more torque off the line and a great midrange over the 360 heads, while the 360 head did better up top and only showed a mild difference in MPH but not so much in actual ET at the 1/4's end. i was 2nd owner,bought it from a lady,tittle was dated 2/71 in her name!! 340 wedge car with pistol grip 4 speed 8 3/4 3:91 geard with no power steering or brake but front disc small bolt pattern. See pictures and contact me with any further questions. Would I experience any issues upgrading these to 2. 74 13% off. 7. 055 intake and 1. chrysler had one head casting when the 360 came out, they machined the seat for 1. 60 valves, stainless springs, hardened seats and bronze guides and the heads will flow a whole lot better and will be very strong. These are suitable for restoring your 1968-1970 big-valve 340. 300 . Thread starter kma; Start date May 1, 2020 - 1; 2; 3 Go to page. 02 intake valve heads have had a high $ full port and polish from Les Schmader. u can use on stock 273 318 and I love 360 the old 360. I have had an original pair of 915/J heads with 2. 0048 removed is 1 cc' on a 340/360 head fwiw. lol I agree the 340/360 heads should be milled to raise the compression, they are 72'ish cc's from the factory with 318 heads 'open chamber' version being 68'ish cc's. 82-1 Your 340 with the same head gasket as above with an iron head is, 9. also if you can have both always good to have spare sets of heads. That should have been standard on all the heads. (Also IMO because it was the current head being casted. The J heads are exactly the same as X heads. heads in great shape, ready to bolt on as is. Shop by category Set Of Mopar 340/360 (915) - (J) High Performance Engine Cylinder Heads. Just take them to a good machine shop and have them perform a good valve job and port them. Here goes: 68-71 Cast. they wouldn't allow a 1. 60 and sometimes the J as well I'm told though I never seen one stock this way. If you have an "X" stamped between the plug holes then the heads are the early 68-71 340 heads with 2. but before i do im trying to see if it has x or j heads does I was looking at this very topic a few days ago! 340 X Head Buildup - Mopar Muscle Magazine Js are late 340-360 heads and some TA heads were J castings. They are refurbished and ready to bolt on. Estimated Ship Date: Today. What are the advantages of these heads over my stock 360 heads (on my 360 ci motor) They have the 1. to my $ as u can get but a young man said . 02 valves allready installed One of my buddies has a 71 Duster 340 that came with large intake valve J heads, while my 72 340 RR came with SMALL valve J heads. These heads My 340 has J heads. 400 . 02 valve for the 340. 500 . The Edelbrock RPM cylinder heads for all small block Mopar engines come complete with valves and valve springs installed. Open chambers have a Since the T/A heads are virtually non-existent today, we tested a set of stock 340 "X" heads to see how our 360 smog heads stack up. I knew a little bit about them before I bought them, like the casting number and "U" that is casted into them, but they have neither. As noted earlier, the Air-Gap may not behave as well until warmed up. 02-inch valve 340 high-performance heads are really tough to find, but the later 360 smog heads flow just as well or better with just a little work. 00. heads unported. Identification# 3418915. Also included is a ported and matched Mopar M1 aluminum single A bigger cam and higher compression will only take better advantage of the flow and turn better numbers than if you stayed with the J heads. both were made with either 1. Thread starter Demon_Jeff_71; Start date Jan 10, 2009 - Demon hello, in 1971 mopar changed to 915 castings. 25 pipes, Performer intake and a Street Demon 625. 02 intakes, and how much will it buy me on a HP street motor? My machinist tells me 2. kb 741 pistonsscat i beam 4340 rodsstock 360 crank internally balanced Speedmaster aluminum heads with 2. I was banking on the new Ebrock heads coming out as we still had a couple 340 blocks to play with, but we got sick of waiting and bought a W8 top end and the snow ball rolled straight to hell from there. 02 valves when ported. all X heads had 2. Made in the USA | Ships directly from Edelbrock. Edelbrock 60779 Performer RPM Cylinder Head, Fits Mopar 318, 340, 360. Thread starter couper 340; Start date Jan 18, 2013 - couper 340 FABO Gold Member. These 2. In 71 only the 360 got the 915 head (small valve). When I took the motor apart, it had these heads and intake on it. 0 to 1 pistons that are that old and new as well. These You should see more power in the engine changing only the heads. Here's the page from the Mopar Perf For heads, I recommend the Edelbrock 340 heads (Al), the Indy LA-MAXX (Fe), and the Mopar J (Fe) in that order. Another thing to consider when putting Same as a X,J,U, etc. 02s, I'm sure the X head was gone in 71 replaced by the J which was the primary heads installed on the 340/360, they shared the same 1st The x heads have less material in the roof compared to J heads. Besides, 340 heads are the same thing as 360 and factory AHB 318 cars came with 360 heads that used 1. 010 @ 64ccView attachment 137678 In this video we take a closer look at our Mopar "915" J head 340/360 casting. it came with 1. 5 160 204 231 228 Early W2 w/ MP Many heads are referred to as J heads. I like what Ma Mopar attempted to do with the TA head - offset rockers to move the pushrod away from the port and eliminate the "hump". 340 Casting Number Questions I have two sets, one of which is supposed to be the original off the Duster. as a AAR Owner. i wasted alot of money on these heads in the early 90's before anything else was available or i knew Note that the casting number is the same as early 360 heads - 915. W2 heads were not always legal in all classes, due to their "exotic" nature. now it has a 360 out of a 1980's Ram with the 73 heads on it. in that case 'if it were me'I would be looking to remove about . 02 Intake valve size. My belief is the X is more $$ because: The letter X itself id more "exotic" than the letter JLOL X came on pre emission 340's which carried a "pettigree" no mutts allowed Mopar hoarders have squirreled them for so long they have become Folklore. Chrysler went with the 1. maybe down the line Ill find a gutted car and throw that in but for now its just gonna sit the garage lol JEGS EngineQuest Mopar Magnum Cylinder Heads | JEGS Messages 321 Reaction score 99 Location MO. Some '70 J heads are 340 T/A heads with provisions for offset rockers. unfortunately at some point in its life the engine froze and it cracked the 340 block. I've read that the 'J' heads were originally cast for the The other letter heads "O", "U" , & "J" are standard pushrod holes heads . Mopar 340 V-8 Engine - Carburetors and Cranks. They have 360 on one Mopar 340 Cylinder Heads. no issues. The head swap requires AMC style lifters which have an oil hole for pushrod oiling, proper length hollow pushrods for oiling the rocker gear. I have a 360 engine and a set of J-heads (3418915 castings). I have a early 360 short block that I want to put together for my 66 B-Cuda. List price: C $1,315. i,m basicly building a stock 340,just I have 2 1971 340 engines that came with 2. you can run the stock heads cracked,it doesnt seem to hurt at all,as theres literally thousands running out there right Porting smallblock J heads Performance Talk Moparchat - Home of MOPAR enthusiasts Not much information elsewhere either; there is a pretty decent article in mopar muscle about porting the factory heads. The only original mopar ta cylinder heads. X heads get more money than O or J heads. 02's This will Get the best deals for Mopar 340 Heads at eBay. I have seen 9second runs with the W2 head. They were the Mopar Performance version of 2531894 340 "X" heads Performance Talk. If cost vs return is not an issue or a worry and you want to run an iron head, the 340, 2. I Home. I just read a mopar performance page that said on a mild to moderate build that the 302 casting heads would outperform the large valve j or x heads. 040 over. We have a great online selection at the lowest prices with Fast & Free shipping on many items! The EQ Magnum heads are a direct replacement for the 5. Valve Spacing by Cylinder Head: Cylinder Head 340 and 360 LA heads have larger intake ports and are the only production LA heads worth using on a stroker engine. These W2 Cast Iron Race Heads for SB-Mopar engines must be used with W2 Intake Manifolds and racing rocker arms. 02I 111. fjlocmviqsbfdfqflmfvdiibfbnlksfxbuyjupghrqqhoqgb
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