882 vs 193 heads. however flow flattens out from .

882 vs 193 heads the basic bottom line here is that the stock L98 aluminum heads flow about 200cfm while even vortec heads flow about 230cfm and thats a significant difference, yet even vortec head are restrictive if your looking to exceed about 430hp, good aftermarket aluminum heads with 215cc or larger ports from AFR,BRODIX,TRICKFLOW,DART can easily flow 270-300cfm, I did build one 383 with the 193 swirl port heads for a friend. You will still be close to 10:1 SCR with those heads combined w/ flat top pistons'but'still a lot better than the 081 heads. i am going to run nothing but 87 octane in the truck, so im tyring to 193 Tbi vs 993 heads. Jump to Latest 14K views 14 replies 6 participants last post by MA69CAM Jun 18, 2006. The L82 came with 882 cast iron heads with OEM screw in rocker studs and guide plates. I've never seen a 292 head, but thought I read somewhere the sportsman were copied off it or something. 882's are a good head but you have to watch for the cracking problem [ November 24, 2002: Message edited by: BOBCRMAN@aol. 94 intakes. The port flow numbers are roughly equivalent to a decent set of older iron heads like the 882 or 441 heads. I played with 492, 041, 186, 624, 882, 461, 462, 450,193, the list goes on and on and my favorite out of all is the #601 305 head Pretty good chance the 91 truck had 193 heads on it. 5". 4k 191 and 193 heads. Granted, I'm not looking to make over 300hp anytime soon so just a little bump in power would be cool. 60") >GM 441 iron heads (actually flow better to . 12% 339. Beginning in '71, the 882 head was also used on the 330-hp 350 and the 400 small-block. As far as running it on pump gas,I would say no. Top. This head was tested with the 1. These castings are available from just about any I remember chuckling about the fact that the 882 flowed pretty much the worst of all of them, but people still bragged about having "882 Corvette heads. hydraulic 260-270 dur 470-480 lift cam with option 2. better flow, better chambers, after modifying the springs you can run a higher lift cam. So is the Block. The 193 head does not simply bolt to the intake you have on the 882 headed engines. the 882 heads were installed on the 350 ci. I'm going to use the 882 heads as the first example. to me, IMHO, they The heads are casting 882. 333882 heads {been called the best of the WORST (light weight castings)}. The angle the center pair of bolts on each side of the plenum makes a different angle with respect to the head's intake gasket surface. 450" lift. however flow flattens out from . We did several thermostat to weed out any outliers but the results were consistently the same. With prices to rebuild stock The casting at the spring pockets are different so the pockets are not as deep as the exh pocket on a 193 head. Jump to Latest The 993 and 882 heads are both large open chamber 75-76 cc heads for low compression and have a far and away distant spark plug location, not much for performance. 480/. Drivers side 193 head is Junk. 24% 421. Posted February 20, 2011. 50" exhaust valves but the 882's are the first of the 'smog' heads, they flow well and are not the 'lighter' castings, but it does have the larger 76cc chambers, which means I will barley break 9:1 compression ratio with the thinnest of head If you are just looking for a set of inexpensive aluminum heads to use on a street cruiser, the L-98 Corvette heads perform decently. 88bluestar Pro Posts: 411 Joined: Sun May 21, 2017 11:39 pm Location: Re: SBC head ? Post by 88bluestar » Sat Sep 18, 2021 9:17 pm. They are crack pronemore so than any of the earlier 76cc heads. I have read several articles recently where folks are talking about 882 heads as if they were really the cream of the crop. and they are cheap compare to other aftermarket heads. 940/1. 77chevyk10 Discussion starter. the 1. The specs are @5500rpm 390hp/ 4500rpm 412tq. The SP heads run out of intake capacity on a 350 around 4500 RPM. I was worried the heads would be too big for my application, but chad assured me they would work great. 364/2. But be aware 882 vs 492 heads (kinda long) Jump to Latest 21 - 31 of 31 Posts. the book says they are a weak casting and not worth keeping. . 5-9 to one comp. but the head craked around no 3 inlet rocker stud in 2 places and the std moved . If there is a difference, is it going to be $1500 worth of difference? Performer RPM Air-Gap Intake and CompCam Thumpr CCA-CL12-602-4 295/313 is the rest of the set-up. I know the cam is way too big, but I like the choppy idle and Some of the cast iron heads with the best flowing ports from the factory are (were) 441, 041, 882, and 641 + 642's (both of the last 2 being the once popular "fuelie heads" from the 1960's which came on the fuel injected Corvette's). Jump to Latest 16K views 1 reply 1 participant last post by Rmayer May 8, 2007. heres a bit of a comparison between common stock chevy heads vs a mild iron dart head, and yes DART and other manufacturers have much better heads available Chevy 882 Iron in stock form flow 206 int/145 ex The vortec head is a better flowing head than the 882 although to be used with that cam they will have to be machined to handle over . run the 882 heads (please dont bash my 882's here - we all cant be running vortec heads)using long tube headers, hydraulic lifters, roller tip rockers and a comp cam 12-238-2 with the following specs: Duration at 050 inch Lift 218 int. 336 heads. and 400 ci engines(400 heads had steam holes). 7 hp 205/144 70. They are excellent for what they were designed for, hauling the family on a road trip or running to the grocery store or getting grandma back and forth to bingo. 050" duration cam, and forget about a lumpy idle sound. I have a good 1980 K blazer engine, 3970010 4 bolt but I can't see wich heads are on it, they are the original from the truck, they are the ones with the sodium exhaust valves, are Thumper cam, street dominator intake, 882 heads and powerglide is a recipie for a car that is slow AND gets terrible gas mileage. Round push rod holes. 45 posts · Joined 2021 Add to quote; Only show this user #1 · Jun 18, 2022. a 350 smogger with fresh v/v grind # 9889338, (very similar to the 882 casting,) and #3) a TPI/TBI 14102187 with 3 angle v/v grind. But I have two sets of cylinder heads, 882's (casting# 333882) and 193's (casting# 14102193). I know this is a little weird, but if anyone can help, I need it. 94 valved 993 head, and can always add to my stash of 882's. 94" Intake/1. 39% 423. 60 valves reground and a set of valve springs that match your cam. Ranging between 300-/350hp/ 330-370tq. 94 intake valves and low rpm valve train. rpm. 0 mustang gt's! but one did crack months later. It flows about 210 cfm on the intake side max An aftermarket head such as the AFR 180cc, Pro Topline 180cc, GM Vortec, Dart Iron Eagle (etc, etc) head will move much more air. 50 stainless valves. I want to run 350-375 hp on pump gas and keep C/R at 9. keeps the coolant bulk temp at that compared to standard thermostats also rated at 180 keeps the bulk coolant at 193. Testing was corrected to 28” and done over a The aluminum L98 heads (113 casting) are equal to the iron L98 heads on the int, and much better on the exh side, and slightly better than the 193 exh as well. Depending on the cam, intake, pistons, and headers you run, you might get up to 350 - 400 hp out of them -- maybe more if you heavily work the heads and rev the crap out of it. /224 exh. With a TH350, a Weiand dual plane, a Holley 600, a 350 Now the 882 heads I had measured pretty large on the intake runners. A good head for a 350 that is affordable is a dart 180cc iron eagle then go buy your own parts, manley street flow valves or your stock 2. Both have 1. The exhaust ports are a little wide for std exhaust bolt pattern IMO. Too bad shipping would be so crazy shipping those headsI need another 1. 7 hp 206/145 70. I can pick up a rebuilt set of 624 heads for $100 through a private sale which I could then just throw on the truck and drive. C3 Tech/Performance - 882 vs. Buy a set of used Vortec Heads at the local junkyard ($210), Vortec intake manifold ($140), center bolt valve covers ($40), balancer & Gasket set ($100). I picked up my free 882 heads from my buddy today. The 882 was #5 of the five castings tested, and casting 041 was the best. The head that is Pretty good chance the 91 truck had 193 heads on it. can my heads except this amount of lift and is 882 vs. On the plus side, the aluminum Corvette head offers a slightly better exhaust port than the older iron Brown's '90 12-ton truck heads should be a No. A small bore 2 BBL intake off of a 283 would also work very well on The 193's are TBI heads (1987-1995) and have intake runners of arund 150cc with swirl port design with a 67cc chamber - basically first generation Vortec. A lot depends on the cam & the point @ which it closes the intake valve which will determine your DCR,or,actual compression ratio. 50, 600cfm edelbrock carb, Performer RPM intake, headers with Flowmaster 40 series mufflers Now the 882 heads I had measured pretty large on the intake runners. 5:1 compression ratio with these heads, comp cams . My question is what heads would be better for my car 882 or 193 swirl ports? The 193 heads are not Vor-Tec style heads. You may want to re-think this a bit. But,from the Chevy mania website that has sbc serial numbers, they say these heads are extremely crack prone. I suspect the 336's (they were for 1971 cars) have smaller ports as that aera of the smog laws were not nearly so bad as 1974 when the 882's came out. I would not use the -896 heads on the 350, on the 283 yes. Post by IMCADW » Tue Feb 14, 2012 1:09 am. So here's another trick in the temperature if you have the 487 heads use them, they are old style castings, heavy, but watch the valve seats. then went to low mile junk 82' vette heads because my 78' nova was my only car in HS and shortly went to replace them with "Not all late 882 heads were created equal. So much to do, so little time Top. Rmayer Discussion starter. The 882 castings had a double heat-riser passage and were prone to cracking beacuse they ran so hot. Performance. Don't bother spending any money on them. I believe that 882's were used for a hsort while on L82's before they switched to the horrible 624 castings624's will crack if you look at them wrong. 1 I have stock 193 heads that i will be porting. 88bluestar Pro Posts: 406 Joined: Sun May 21, 2017 11:39 pm Location: Re: SBC head ? Post by 88bluestar » Sat Sep 18, 2021 9:17 pm. MA69CAM Discussion starter. 050'' Lift:218° Intake / 226° Exhaust, valve lift with 1. The 882 castings were hardly what you would consider desirable. Swapping to a set of box-stock Dart IE 180's (72cc chambers) put me deep in the 13's at nearly 100mph with no other changes. I have both a set of 624 heads and 882 heads sitting around in the shed and I wanted to get everyone's opinion on whether or not either the 624 or 882 heads would be a worthwhile upgrade from the dreaded TBI heads in terms of power. The Bad News; these heads are crack prone!:roll: The proof will be in the time that the heads last, but for me the AFR heads have significantly better quality control than the Dart SHP's that I ran before. valve guide inside the port. And likely better than the other assembled heads that you listed, that run cheaper. 50 E valves. 480 lift cams with 882 heads, use the Z-28 type valve springs, watch for retainer to guide clearance, most will clear if you use an umbrella or o-ring type seal, do not use the tin shields or valve rotators on the springs. Quote; Mike 57. I like the smaller lighter valve stems and the cnc'd controlled volume for the runners and combustion heeelp meeee search my post for heeelp mee and i talk about my 400 and my tale of woe. 030 193 posts · it is common to use up to . Advertised Duration 262 int. The issue is that everywhere I read says the 624 heads are absolute junk and not worth spending any money in them. alot of people cant afford the aftermarket heads and i dont think i would buy them anyway if 300-350 hp is your target. 50. So I Re: 336 vs. as for myself i have had 441's, 882's and 186 (double humps). Im not real big on that cam either. I'd check The 193 heads are an excellent street performance head that make UNREAL low speed throttle response. 462'' Intake / . but the cost of the new vortec style intake could bust the budget, and the the rocker arms need to self aligning style. I currently have 882 heads on my 383. The catch with performance engines is you can usually find ready to run, used aftermarket heads for $450-500. 5. weater thay wer no fitted properly weather The reasons that 882 heads have cracking problems are that the heat crossover passage is fed by the center cylinders and that they were the first of the GM induction hardened seats. 6 valves and screw in studs and guide plates. 76 cc combustion chambers. BUT I have in fact seen & owned them Cast as 882 exact same head as a 881 , late 74 882 issues had the good I wanted to get 400+ hp/torque. 25" exhaust. Oh yea, I remember the big casting in the exhaust port. 7. They are more preferred over the 882 head due to their heavier casting. The swirl vane is a good flow obstruction, these head’s respond better to longer duration cams than they do to more lift as they are peak flow limited pretty early so more duration buys the ports more time where more lift by itself is not helpful Description Professionally rebuilt pair of Small Block Chevrolet cylinder heads. Total $450. I assume that the 882 refers to the serial number 333882. It is a 39700010 so a good block, but it came with 882 heads on it. 67% 219/172 Generation IV Internal Engine - 821 vs 823 Heads - Forgive me if this has been covered before as I am certainly NEW to the LS-Scene with a 2013 Caprice PPV 9C1 L77. Many LATE 74 Z28 and Corvette L-82 applications used a Hi performance cast version of the 882 head . The inaccurate heat treating and the extreme heat caused by the extra 882 heads get a bad rap, and for some reasons rightfully so, they actually flow pretty well for what is otherwise considered a smog head. See All 19 Photos. 500-4,000 max. 500-inch lift the flow is up 15% over the 882 head. SBC. 60" Exhaust Valves, all these heads had 76cc combustion chambers. M. Neither head has the same intake bolt set up as you 1975, you will need an intake for the Every used 882 head I have seen had at least one burned or cracked exhaust valve. 458 Chevy LB4 Syclone N/A - N/A - - - - 165/119 72. the trouble i ran into was needing a bore job and the cost for all that plus installing cam bearings, hot tank, deck the block, was $250. The 882 head is your typical smog-era 70s head. They yield average flow numbers, but respond to modifications just like any other small block head. 80% 180/147 81. They run out of breath by 4500 rpm,so,choose the rest of your combo to match that power band. I noticed that at the top of each pair of intake runners the port necks down just below the valve cover bolt hole. 94 I and 1. I would take a pair of 193s over something like the 882/624/993 casting any day of the week. 480'' Exhaust, and 111 lobe separation. 882's are a marginal head so good for a marginal street engine. To many people read to many magazines the fact is these heads were used in 2. Vortec - I've been told my '79 heads arent' going to cut it in terms of their power potential. Every engine 882s could be called the best of the worst. There's several more but I'm just going by memory here. 7 74. 2/122. In my removal of the L77 engine in my new-to-me car I am learning the differences and similarities as I go. 72% 1. Mike 57 (Non-dues paying) 1. 400-inch lift are almost identical. 10% 419. The screw port actually has pretty good volume, and some of them are only 58 cc combustion chambers. I`m just going to do some bowl work,narrow the guide bosses and gasket match them. Jump to Latest 10K views 14 replies 6 participants last post by BOBCRMAN@aol. 50 valves. Jump to Latest 1. The 193 head uses a 64 cc chamber so it is the high compression version of these Swirlies. Save Share 993 vs 882. The heads you have now have big chambers and the tiny 1. Now Ive seen combos over the internet using 882 heads/ 383 stroker with similar cam specs And im finding numbers that are much lower. 400 The 882 uses bolts that make a 90 degree angle to this surface, the 193 bolts make a 72 degree angle. 72/1. 117 posts · Joined 2002 Add to quote; Only show this user #1 · May 30, 2006. the 882 heads were installed on the 350ci and 400ci engines Sportsman II heads aren't that great out of the box the exhaust needs help I've herd a million times. These heads are very similar to the 441 and 493 400 small block head. You need a very healthy cam to pull it The flow numbers stock vs stock are obviously night and day difference but these 882 heads have been worked over. 193 posts · GM 882 IronThe smallest of the GM heads we tested at only 151 cc, the 882, turned out to be the best-flowing of the early iron heads. Jump to Latest 882 Large chamber (76cc), hardened exhaust valve seats, compromised intake port(‘71-’76 350/400cid), best of lightweight heads P Double (Captain’s) bars 193 Mid-’80’s style centerbolt cover with restrictive vane cast in intake port (hi-swirl); not recommended for high-performance Just as a comparison it went much harder than an identical 350 running the more common 882 heads. Good for a low rpm truck applicationand thats about it. The screw port actually has pretty good volume, and some of them are only 58 cc Keep 882 heads (already have crane springs), add an aluminum intake manifold ($140), 8" harmonic balancer ($60), new gasket set ($40). spend your money on nice 3 angle seat ond clean up the pockets yourself ( minimal labor and rewarding ) and and buy a set of 1. i was looking at comp cams xtreme 4x4 cam with, 262° Intake / 270° Exhaust, Duration @ . and yes, edelbrock dual plane intake and 600cfm carb, and the primaries on the longtubes are 1. 94 Heads, i am hoping to make 350-375HP with them. This needs to be 8. LD L05 Piston This head is very similar to the 882 head tested earlier. 461 vs. It will make good power up til 4500 or so. 000/1. 8K views 2 replies 2 participants last post by Sean’s73novacustom Jun 18, 2022. When I install 882's I use the intake manifold restrictors on both heads, this helps reduce the cracking of the 882's! It's been maybe 10 years since Hot Rod Magazine did their "Head of the Class" article on small block chevy head flows. The intake can be modified but it is a little tricky in that the existing What GVX stated is the same thing that people stated about the 305 heads. The engine not quite sure on the cam size but it has 882 heads, performer intake, 1" carb spacer and i have either a holley 600 or carter AFB, long tube headers with true duals only 2. This was due to the double heat riser About 10 times thinner than a Pontiac 400-455 Engine, Olds 425-455 & 366-427 Tall Deck, & Musclecar era 1965-1974 BBC engines. 882 heads are THIN castings that provide about average SBC OEM performance. I am looking for an inexpenisve iron head to replace them with. Despite that MotorTrend has measured them (the 810 heads) to flow 146 Exh @. I have a chance to buy 186 heads that are already setup for unleaded gas, and have threaded The vane in the valve pocket of the 193 can be ported out; this makes what essentially is a cast iron L98 head which actually exists as castings 14096217 or 14101083. You will have to shim the exhaust spring seats,Check for stock rocker to stud Here we go again, Put the humps on if they are in good shape they are far better flowing than the 882 castings. This is thread for more info on the Caprice years ago chevy made almost exclusively, just standard strait plug head designs, as technology improved, it was found that getting the spark plug as close as you can to both the combustion chamber center and the exhaust valve helped power, as the technology advanced the later design strait plug heads also had the plug location moved, so the original advantage . the engine is a 350 Steel crank, 4 bolt main, 9. Re: 441, 882, 487X VS EQ IMCA Stamped Spec Head. 480 with a 750 cfm and single plane. IMCADW. so for know the 350 is toast and the vortec head had been messed with with screw in studs fitted . Some of these even had 2. 94" intake and 1. i guess what my question is. And the 113 castings have a revised exh port shape than the 083s so that explains the exh flow difference. The bump in compression will help also probably a 20 to 30 h. 50E valves: the casting number was 333882. 29% 125/109 87. The 493 head was most often used on the '71 400 small-block, 193 Swirl Ports have a 64 cc chamber where the 305 heads usually are around 56 ccs so you'll give up some compression all other measurements being equal. unless you run guideplates General Chevelle Tech Area. 94I and 1. 785 posts · Joined 2005 Add to quote; Only show this user #1 · May 7, 2007. Theported (stock) cylinder heads offered by Power Heads were far fromexotic. until you look. i would say you'ld be okay as they have 1. 810. True, Most early 882's were equipped with 1. 71% 204/143 70. 455/406 Don't know about 336's but 882 flow pretty well. All the research I did on the X head said it was the same with a I have a set of Chevy heads with a casting number of 333882, with 1. 94-1. 500-Pipe 76 70/59 84. 882 SB Heads VS Dart Iron Eagles. I am lookin for some 993 heads because my machine shop guy says thats the route I wanna go. com ] 487x heads flow the best out of all the big chamber medium valve heads (1. 02 etc they will be better than what you have now. If you are set on the 882s, get your self a performer dual plane intake, ~210-215@0. Some books say model years of 1974-80 and other books say 1975-77. years ago i ran these 882's in high school and they worked good after a full comp port/polish, port match and 3 angle polished valves, they were good for 330hp , good enough to beat many 5. The 882 heads are smog heads from '74 to '80 and not very well regarded, but neither are stock '85 heads - if you can find out more about the 882's they may be better than your stock '85 heads - ie not only polished & ported but if milled so they will give higher compression and if valves were changed to 2. Both castings make two different part numbers one with the center intake bolt angle of 90 degrees to the port face these fit 55 through 86 intakes; then there is the 72 degree bolt angle on the Those heads have tiny little 155 cc intake runners and will barely eclipse 200 cfm. The valves are larger and the flow numbers at 0. The 193's are TBI heads (1987-1995) and have intake runners of arund 150cc with swirl port design with a 67cc chamber - basically first generation Vortec. 882 heads 11-11-02 08:48 PM - Post# 135201 In response to IgorT. 94/1. What are the 882 flow numbers Thing is a beast from bottom through top. They are 64cc chambers, but the swirl ports limit breathing to where they are limited to about 3. Scorched & cracked between #3 & #5 like a 882 heads get a bad rap, and for some reasons rightfully so, they actually flow pretty well for what is otherwise considered a smog head. 5:1 or below for pump gas & iron heads. 50) these are highly sought after and would give you a small performance boost over your 624 or 882 heads. for a mild street engine wich heads would you choose 882 or 487 ? I have both and plan on a mild porting, the motor will end up in a t-bucket I'm planning to build. 02 valve form up to 375 horse stock. Heads have the center bolt through valve cover. i don't have a problem running 882 heads, but i've seen more bad 882's then good ones. They are already set up with 2. Hey guys, i have some #882 heads on my truck now, which i am hearing are very restrictive. The 193 heads are designed for lowend torque. Three-quarter-ton heads had No. the same book says that if you buy an engine that has 882 heads they should be discarded. They were fitted with either 1. 60 valves well thank you or yore help . im with your builder. The aftermarket head will also usually have a smaller, more efficient, combustion chamber increasing compression while I believe 193's are a swirl port TBI headnext to impossible to port and dont flow for crap. The 882's arent the greatest head but are the better choice of the 2if they arent cracked. Up to this point the 882's flow as good or better than >L98 aluminum heads (actually flow better to . 76cc 1. R. Another casting difference is that there is way more meat around the exh. These heads were cast differently than the other Chevy heads (similar to Cadillac castings). even with 8. Do I just keep the heads and forget about the 993's. 550 65 - 123/108 87. peces of the head droped into the intake port and into the cylinder beat the piston up and put a 3/8 gouge down the bore . With 882 heads (76cc chambers) it ran low 14's in the 1/4 mile with speeds in the low 90's. OR, run those 882 heads and put some flat top pistons in the motor. Granted, they'll be small, like a performer or dart iron eagle 180, 882 heads were designed by Chevy to be used in 350 ci and 400 ci engines. The "Chevrolet Small-Block V-8 Interchange manual" by David Lewis states as follows: a lighter cast head was released sporting 1. With a simple gasket match the 882 will flow better than either one of the others. 50" Exhaust, or 2. com Apr 15, 2017. 191 castings; 1-ton used No. 94 valves flow almost 882 heads vs 186. 193 Location: Fulton,NY; Occupation: Automotive What do you guys think about the 882 casting small block chevy heads I have a set there 76 cc chambers good shape I here they flow real good but I also here they crack under high temps. You really need to cc the head chambers to see what they actually are. 02/1. The aluminum L98 heads (113 casting) are equal to the iron L98 heads on the int, and much better on the exh side, and slightly better than the 193 exh as well. Well, there's good news and a little bad news about these heads! The Good News; Chevy used these heads from 1976 to 1987 on 350 cid engines. 84 posts · Joined 2016 Add to quote; Only show this user #1 · Apr 8, 2017. Casting number is 191 or 193 on these heads. 500 (& 166cfm Inlet) Those heads (882) will make the power your after but they are junk, anytime you have a head that the heat cross over gets into both exhaust ports it not a good ideal, the 441 head would be a better choice. I bought the motor for 100 bucks so I couldn't resist. Furtherore, I am leaning towards on older pair of used 882 heads, w/ no work done to them. 624, or 882. The 882's will give you a refresh of what the truck had, but porting them is an exercise that can generate some power especially if you can mill . 02" Intake/1. Sean’s73novacustom Discussion starter. the crank was shot too as the Chevy '882 CCM 151/59 1. 193 casting like this. The 193 heads DO NOT flow as poorly as most would make you think when compard to other stock heads. 60") The 993 heads were used in 72-73 Chevy 350s, many of them were the 250 horsepower version. The head that is usually refered to as the "Vortec" is the 1996-1999 with 67cc fast burn chamber. And they do. As already referred to, they are highly prone to cracking in critical places, and do not take kindly to port work as a result; their I had a set rebuilt then after rebuilding them i went with the vortec heads. The 624 heads are among the worst of the worst. running the summit cam becuase its $48, and its got to atleast be the slightest bit better than a stock cam. 5 rockers . 20% 175/136 77. Many classes of dirt track racing are restricted to these large chamber heads and the racers are looking for this casting number specifically. BBC HEAD STUDS VS. /270 exh. i am just repeating what the book said. p gain will feel much better seat of the pants wise. I want to say stock they were in the 170cc area. 4 hp - - - - - - GM LS-1 204/- 2. 8 hp 459. As for an estimate of power I can't say but if the vortec heads work well with the bottom end it has its a safe bet that it will have more power than it did. Best I can find is a fairly consistent >200cfm rating in the garage is a well used 350 wearing some heads with casting 993. So i changed the cam to dur@50 230/230 valve lift . I weighed a 882 vs sportsman and In 1975 , a lighter cast head was released sporting 1. The heads on my truck are of the 882 variety which need will need a good cleaning and re and re. Total $200 2. 400 inches on. 480 lift with 230/230 Duration at 0. My only concern would be using them in a application like mine with limited off the shelf header selection. now having said that, i know people who have built 882's and are very happy with them. " I had a set of 487X heads on my '73 Hatchback Custom 20-something years ago, which I *think* were factory heads that came with the car. 8 hp - - - - 164. The reason that the earlier iterations of this engine cracked was due to the fact that they ran really hot. At 0. preferably a torque engine. tvoruq njhme xfqvvc tbnhtbj zdljr omivkvo hiondzks ajtyn rpug bdjr