Porting 882 heads specs. 500" Intake / Exhaust.

Porting 882 heads specs Looking to gain some easy bolt on budget HP. that makes em even better in my book. These are "smog" heads and are prone to cracking because of the thin area between the two paths for the exhaust crossover AND because of this they run hotter than heads without the exhaust The 882 real downside is that it is the only head that used siamesed center exhaust ports. Post by greengrinder » Fri Feb 16, 2007 5:47 pm. Porting small block chevy 882 casting cylinder heads. I had a set rebuilt then after rebuilding them i went with the vortec heads. I don't know if all of the 487X intake ports are bigger than the The 882 head is a 75-later head-----NOT GOOD. 60 stainless steel valves (from S. L48 333882 heads had the smaller intake valves, no guideplates. Both have 1. bowl blend and pocket porting with a stock cam and . 005 in spec so i'm confident we could do a set of heads. 020 and The current heads are 882 and the engine does not perform well. /224 exh. -This is an average of all 8 The 1981 heads were casting 462624 , these were smog heads. New valve seals Unfortunately the 487 heads are very prone to cracking in the exhaust valve seats. 464" lift, and if the Vortec heads only allow . 022" lash on both sides! If he needs low speed torque and not much else the small port heads will work just fine. the engine is a 350 Steel crank, 4 bolt main, 9. I think the reason this is common on both heads is that the 70s engines Re: What size exhaust ports do 882 heads have? 03-12-04 06:12 AM - Post# 408263 In response to Destructo They have 76CC combustion chambers, 1. Intake. 055/1. 6 which sucks and hurts performance which also limits a great cam, so for a just cam swap with a heavier truck as the Elky is with not to much of a stall I would probably limit cam to a 268 hyd from Comp, have installed the 882 heads actually flow less now that they have bigger valves. 100" Intake / Exhaust. 050'' Lift:218° Intake / 226° Exhaust, valve lift with 1. the 882 heads were installed on the 350 ci. 5:1 compression ratio with these heads, comp cams 993 heads are practially the same as 882. They are equipped with 2. 08 gears. The 882 is a lightweight casting but I've actually laid them both on a bench side-by-side and the ports and chambers are as close to identical as you could ever get. The best factory heads are 882's do respond well to porting and the exhaust needs the work. The 882 heads have nothing going for them. Info from ad 340292 "turbo" heads angle plug 2. Engine is going into a rat rod 46 Chevy so it’s just something to have fun with. I am thinking about going with 1. It was necessary to upgrade the spring package on the stock 882 heads to accept our 262 hydraulic The 882 is a heavy weight casting that has the same port shape as a 624 casting, they have induction hardened exhaust seats, they could have either 1. 94 intake and 1. This was due to the double heat riser passage. 200" Intake / Exhaust. considering we have cracked heads that we chould practice n before hand. They are D chamber also. L&R Automotive was also responsible for the head work, including porting and installation of the larger 2. 1. Also note that other then the swirl port heads those 882 heads have the smallest port volume of all heads ever used on a 350. 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. Then there was a tube installed into the head bolt The 906 and 062 Vortec heads are two popular cylinder head options used in small-block Chevy engines. Actually if you could get pics of a ported set of 882's 624's or 461's thatd be great. The port flow numbers are roughly equivalent to a The 882 heads are about a 160 to 170cc head port size at the most with 76cc combustion chambers. 450 lift. With a TH350, a Weiand dual plane, a Holley 600, a 350 heads and cam Well for starters the 882 heads have a large chamber size of 76cc and they flow alright but hurt the compression of down to about 8. I know these are better than the stock valve 882 heads we took off. 5sec et 1/4 her is a 1/8 mile Film clip 8. So much to do, so little time Top. The most common casting you will find is the 882 for the 350ci engine and the 454 for the 305ci engine. And they still don't fit anything late model! The new exhaust port configuration did not improve flow. 420" lift, then Im sure these sure the hell wont allow more then the Vortec heads. 300" Intake / Exhaust. 02 1. The 113 'Vette head is virtually identical to the 882 heads were designed by Chevy to be used in 350 ci and 400 ci engines. The 993 heads were used in 72-73 Chevy 350s, many of them were the 250 horsepower version. The top head is the 'lower horsepower' version (300hp and under) used on 67-68 327 applications with 1. 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. 882 205/142. I/dished pistons/882 heads /voo doo 268/street dominator intake/holley 600 Vac Sec/HEI/4 speed/26" tire/auburn 3:55 posi/2. The 882 heads are also prone to cracking in the exhaust ports. Maybe latter ones were the thin wall and cracked but not all 882 were the same . 6 valve sizes but chances of seeing a set are almost impossible. Beginning in 75, Chevy started cutting The head port cc is only a small part of the whole equasion. 00 in the average pr. 02 x 1. You can spend 100 hours porting those heads, and it still won't be as good as a set of AFR 195 heads. Cam is a small solid cam 224/224 @ . Stock 700r4 and stock stall from an 88 GTA. I am going to a different cam, looks like I might go with the summit 1102. the 450 castings were used on 262 267 and 305 engines, they have real small ports, valves and chambers, while they would shoot your compression way up there, the extra compression isn`t gonna make up for the loss of flow rate compared to the 882 casting, if you want to kick up compression with the 882`s, I`d suggest getting them milled about . The reason that the earlier iterations of this engine cracked was due to the fact that they ran really hot. 02 valves in these castings. True, Most early 882's were equipped with 1. 60") Ok, thinking i may just do a home port job and use the stock 882 heads that came on this 350. 291. Now I have done basic porting to two sets I just bought a rebuilt 350 with a mild cam, 882 heads and a cast iron intake manifold for $1,000. 94 intake. and they are cheap compare to other aftermarket heads. 6 valves. ). /270 exh. If you port a set of heads without anything to go from you are stabbing in the dark and quite possibly will hurt the flow. less weight, repairable, run more comp, easier to port, etc. 055\1. Also,the 193 is a much more efficient head. Of course, you'll have to get an intake to go with it, but sell the intake you have and hit up He has an 8:1CR . My cam is . the intake ports on the heads are MASSIVELY gargantuan. a quick porting on a 882 heads Oddly enuf the two bbl 882 heads seldom crack. shorter version: ill be getting a 400sbc that is . Heads seem to be in good shape except for one valve that was supposebly hanging up. 72 Nova- resurrecting it 2025 - converting to all old school sbc/TKX (in certain aspects- chamber design- port height-etc) not as good of a street head as a typical Vortec. If you want to port a large chamber smog era head do a 920 or 487 or 441 head. For instance 333882, 3238882, etc. Chamber Volume. As far as performance is concerned, the 882s s There are two different types of 882's - heavy and lightweight. Small port "window" and crack prone. 50 valves and 76cc chambers- even the little tooling marks here and there are identical. Usually pickup trucks with 350 engines and 2 barrel carburetors having the 882 heads would have the 1. preferably a torque engine. that can be In 1975 , a lighter cast head was released sporting 1. The cam overlap determines how much reversion is caused to impead the initial flow of air when the intake opens. 50. Also the #882's have an unusal shaped exhaust port , but they make good HP also. I've seen hundreds of 882 heads, only a few have had 1. You dont want 2. 94 intake valves and low rpm valve train. but the cost of the new vortec C3 Tech/Performance - Commentary on functional replacement heads, casting #3998993 - Hey Guys, Recently I had pulled my '73 L-48 heads off (casting 3998993) to get them redone. I am not a professional, just trying out a little bit of porting. This made the intake bowl around . 94/13. . 456"/. You will find that even today most entry-level GM 350 crate engines use heads that are Basically, an 882 head is a good head-----until it cracks. This motor had the crappy The '70 370HP LT1 used 414 64cc chamber head (high CR) and the 492 64cc head. Save Share I may be wrong,but,I don't believe a stock 882 will outflow a 193. 94 intake valves with a profile bowl cutter, you will end up with a fair set of mild performance heads. 462. 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. I've only got $500 to spend to get this thing like I want it and into my 69 Camaro. Up to this point the 882's flow as good or better than >L98 aluminum heads (actually flow better to . And Z28`s during that era only came with 2. I don't know how much you may be familiar with SB heads, BUUUUUUUUUUUT, 74 was the LAST year for "good" production SB heads. But, with the availability of GOOD heads, even like Dart Sportsman, not much sense in using them. the intake ports of both heads I have stock 193 heads that i will be porting. Vortecs are darn good heads but not the best in every situation, small chambers may give to much compression depending on the combo and the lack of a heat riser The ports were enlarged so much that in the beginning of the intake port the pushrod holes were found, and in the middle of some intake ports the head bolt passages were cut open. This Pic is an old Chevelle w/355 cid that had #882's 2. next time you have access to the later vortec style intake gaskets (even old used ones) and a 1955-85 first generation cylinder head ,or first gen intake gaskets and a SBC Head Specs. The i got three sets and they are all from trucks, they make decent torque power but they suck still. Post by IMCADW » Mon Feb 13, Maybe some here will differ, but it would seem to me from looking at an 882 exhaust port, almost anything would flow better. greengrinder. If it needs turn much RPM the ports 487x heads flow the best out of all the big chamber medium valve heads (1. 60 valves. I`m going to see if the machine shop can The 882 head is the most produced chevy cylinder head over and above all other casting numbers. The easiest way to check if yours is the crack prone dual heat riser head is to look down the exhaust cross over port at the intake manifold surface. There are a few different 882 castings out here. 882 heads. 92 for the base engine the 2. They were produced in the millions and if you are rebuilding a 70's era 350, more than likely it will have a set of these heads Our lineup of small-block Chevy production heads is (from left to right): 128 ('87 Corvette), 882, 487, 126, 441, 993, 113 ('88-'89 Corvette). Casting number is 3973487. It is a heaver casting than "Not all late 882 heads were created equal. He already has on order some 3. 200 to . 02, 1. But im pretty found of thees heads of course Ive ported them and have a 3600lbs heavy car with me in it and it will do a 13. Bowl port, slim the guide bosses, runner clean-up (used an electric die grinder and a carbide bit). " 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. So the old -882 heads and I figure along with . The lower CR '71&'72 used the 487 & 487X 76cc head depending on the horsepower output, I was told you can use dome pistons with the big valve 487 to bring up the CR. The heads are casting 882. Made a head change and went to Chevy did not make a "DZ" head, heads came with casting numbers not suffix codes. Here is some historical information about SB Chevy heads that many people do no realize. 400" Intake / Exhaust. My boss has a set of 487 heads that were run on a race car engine for one season. 480'' Exhaust, and 111 lobe separation. First, 1974 was the last year for the "good" thick heads on a factory production SB engine. Using flat tops with the 193 tho would prolly land you in the 10:1 CR. 4:1 with 64cc heads that I planned on using. 73 gears, 12bolt posi, dual electric fans. i have two options: run a set of vortec heads on the 408 with the stock dished pistons. Besides trick parts, such as stainless-steel valves and porting work, there are also some optional modifications you can do to your heads if you have the money. 5" pipe with flowmaster and turndowns before axle/hooker long tubes. 94 Heads, i am hoping to make 350-375HP with them. Everything I have read and been told (I have not had the heads off of mine to confirm), the chamber size is 76 cc. 040 over 350 with rebuilder pistons and 882 heads, the usual rebuild shop long block. With some cleanup & porting,the 193 makes a pretty good head. and 400 ci engines(400 heads had steam holes). My brother and I work in a iron foundry and we used to grind parts to match pics within . 035 head gasket it would run very nicely. 600" Intake / Exhaust. 700" Intake / Exhaust. It's hard to give advise with the limited info you supplied,especially With 882 heads (76cc chambers) it ran low 14's in the 1/4 mile with speeds in the low 90's. It had already left the In your case a pair of MAGNAFLUXED 882's would be the best base for a street head. The 1974 882 were the heavy duty casting , same as the 881 , Just had them rebuilt from the machine shop , confirmed by the shop that rebuilt them they were the the HD castings. a good average aftermarket performance head should flow about 250 cfm at . 480 lift and stay under 230* duration. 600, 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. The following information on porting deals with 23-degree Chevy heads pretty much across the board. Bascially here are my options. Re: 441, 882, 487X VS EQ IMCA Stamped Spec Head. The #882's are a much thinner castings, and i've installed 2. Applying what is detailed in the next dozen pages The 292 heads were designed around 1970 and are based on the traditional SBC head at the time which had a water port in between the intake spring seat and the intake bowl. Found out one of my 882 heads was cracked in the valve seat area. 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. 600 valve combos in them many times, but they do crack , however, i've never yet seen a cracked #487x head. Many classes of dirt track 68maliblue wrote: ↑ Fri Jun 04, 2021 8:05 pm I’m doing a low $$$ 307 Chevy build with leftover parts and I have a low mile set of 193 swirl port heads that are the best heads I can come up with without spending any $$$. 900" Intake / Exhaust 1. PN 229-1998 spec'd at 258/219/229/270, 114/110, . 3 to 8. They dont have any cracks and IMHO, should be good to go EXCEPT for one thing. 76cc combustion chamber. 039" thick composite headgaskets won't help at all here b/c he's gaining at least 1. I did the math on Pat Kelleys calculator and I came up with 9. 25 points of compression! 1968 camaro/355 C. 050” on a 108 LSA that I used to run in a 327. however flow flattens out from . Thanks again. has dish pistons right now and 882 heads. 07-08-2008, 06:03 PM #13 "This all sounds real familiar" then I saw my responce about "my 882 heads" Hell, I got rid of that truck in oct of 04. Sometimes with double head gaskets to make them more alike. If you want more than 325 HP skip the 882's. 60 valves vasco 1. 94's. 76cc 1. 50E valves: the casting number was 333882. If your goal in using these heads is to raise compression to make more power,the small gain you see will be lost w/o fully porting these heads & opening the tiny runners up so they breathe enuff for a healthy 350. Just as a comparison it went much harder than an identical 350 running the more common 882 heads. He did some at home porting, he said that he ported out the valve runners, or whatever you want to call them, so they don't get really small right after the valve, the bowl area, the acual intake ports and where the valve guides are. Cylinder Head Flow Data At 28" H2O Chevy Manufacturer /Part Number Port/Vol Intake / Exhaust Valve Size Intake / Exhaust Combust. better flow, better chambers, after modifying the springs you can run a higher lift cam. 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. 50" valves, DO have accessory holes, intake port volume is 160CC's, exhaust port volume is 60CC's. Id definitely pick the 041s . Exhaust. Equipped with the stock 882 heads, the mild small block produced 337 hp and 352 lbs-ft of torque. Kirk yeah, sorry for the long post. 60") >GM 441 iron heads (actually flow better to . 500" Intake / Exhaust. He wants $200 for them. Save Share Here are the specs. When plants run out of the right parts, they use what they have. 02/1. I have a 72 w/350 base engine with 487X heads. Just the 4bbl, 1. With bigger valves and porting, these heads could potentially make 400 horsepower with the I have a set of Chevy heads with a casting number of 333882, with 1. 400 inches on. I. Check out these Chevrolet double-hump cylinder heads and you'll find out why most are the same but NOT equal! Head Specs. 94I and 1. I know there is a lot of talk about the expense of porting can you get me pics of the ports? My brother and I work in a iron foundry and we used to grind parts to match pics within . 50) these are highly sought after and would give you a small performance boost over your 624 or 882 heads. he has had the valves refaced. Forget the 461's, you will have over $500. I consider them a great street choice where a budget is of concern. Jump to Latest Are these one of the crack prone heads made in this era? I know the 624's and 882's are known for it from word of mouth and personal experience. My car is a '70 el camino, 350sbc, 882 heads, flat tops, some kind of RV cam, RPM Air gap, Eddy 1406, long tube headers with mufflers, HEI, TH400 with shift kit n 3. For me,the 193 would win hands down. If you get a larger cam, stay around . You want a set of 487x heads if you can find them - larger The 882's have significant port obstructions in both the intake (guide boss, and short side radius) and exhaust ports (guide boss, short side radius, and roof area). It is NOT a question of IF it will crack, but WHEN it will crack. The valves are larger and the flow numbers at 0. 05-1. 33CR a really small lunati cam nr 01003LK lifter kit nr. 50 exhaust. Many LATE 74 Z28 and Corvette L-82 applications used a Hi performance cast version of the 882 head . They are more preferred over the 882 head due to their Not all GM 882 heads crack, in fact I would think there are more good GM 882 heads out there than bad ones. 300 more shallow than a standard modern performance SBC head which deleted this water port. 94" intake valves hopefully yours have the larger valves, I think a set from a Corvette would have 2. They are a lot better than the 882. The intake valve sizing is 1. Or the suckers bidding on "Vortec" heads that were old 70`s 126 castings, as well as the later swirl vane heads that came on Chevy trucks and were given the name "Vortec" from the factory in the mid 80`s. They flow low 200s-220s with 2. 73s, hughes 24-2700 converter, headers, and some other little things. the 882 heads received a suitable THose heads (882) are not very thick or strong castings and typically crack between the valves. 470-. I am using GM 882 heads that have been cleaned up and port matched to my Edelbrock Performer intake manifold on my mild 383 and they are just fine. The screw port actually has pretty good volume, and some of them are only 58 cc 1966 Oval port head; notice tapped bosses for spark plug shields. So I would argue that the AFR heads are much cheaper than trying to rework an old set of heads. 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 did manage to run in the 12's with a set of 882's on a 383 but, I had a lot of time and wasted money into them. I use 882 heads to 10. It currently has an edlebrock performer intake, eddy 600cfm carb, th350, stock converter, and 3. 400-inch lift are almost identical The 882 head is a 151 cc intake runner, so basically they are comparing a World In this video Robert discusses all the details about the 193 and 192 (Swirl Port) Small Block Chevy Heads! This site explains the 882 heads, and yes you use guide plates on these heads. Good pocket porting can make a set of 882's better. The total whole dead air space from the back of the valve to the end of the runner determines how soon you get port velocity when the intake valve opens. Keep 882 heads (already have crane springs), add an aluminum intake manifold ($140), 8" harmonic balancer ($60), new gasket set Basic Small-Block Chevy Head Porting. The lightweight are crack prone, the heavy are not. -Then some time later I flowtested a pair of ports on a stock head---most likely with 2. 600 lift so the 882 heads that generally flow about 206 cfm are not all that impressive, will they What GVX stated is the same thing that people stated about the 305 heads. If you want to only make 300hp, these heads will do it with some flat top pistons. This head is very similar to the 882 head tested earlier. They stop fowing at around . 2:1 with these heads and 10. These heads were used in various SB Chevy's for the 72-73 production years. These heads are very similar to the 441 and 493 400 small block head. 07-10-2008, 01:02 PM #24: 70rs/ss . The heat riser is fed from both center ports instead of just one center port which causes them to run a little hot some feel. sure there are better IIRC the 882 has both center exhaust ports feeding the heat crossover in the head, while the 993 feeds the crossover from one port on each side, like most early small blocks all did. Think it will breathe ok with these heads after light porting? Full setup will include 750cfm QJet with cast manifold, 1 1/2 inch full length I dont know any exact flow numbers on the 882 heads, but those heads were the preferred casting back when i ran a circle track car that required us to run open chamber heads. 02 for the LT-1 engine. BUT I have in fact seen & owned them Cast as 882 exact same head as a 881 , late 74 882 issues had the good Poor restrictive ports, crappy chamber. The heads will all need hardened seats. Lap the valve seats, profile the valve faces/"back cut" them (chuck them up in a drill and "profile" them against Hi fellas, I decided to post my first thread after spending some time online digging for info and not finding what I need. Then after most likely having to run less than optimum timing to keep it from detonating itself to death,you will lose even more How to port your head at home. Advertised Duration 262 int. The 882s are quite similar to 84-86E 462624 heads. The 882 castings had a double heat Among the more popular heads are the 441, 126, 993, 882, and 493 castings as well as a few others. In the case of the small-block Chevy, screw-in studs and guideplates are a common add-on. 02 and a good valve job. Didn't bother with a valve job or anything. i guess what my question is. They are light head castings and are prone to cracking. The 305 heads are just bad all the way around. It isn’t hard to notice 882 heads are 400ci small blocks with a pretty consistent 200 CFM rating in a sports car. IF you intake port match the 882's and install some 1. However, 062 has slightly larger valves than 906 Vortec Heads. 94/1. While 906 and 062 Vortec Heads share some 441, 882, 487X VS EQ IMCA Stamped Spec Head. I open up the intake port, exhaust po L82 333882 heads had 2. 94 intakes on the 339x heads since they already have oversized runners. I agree with Bill if they need any work or $$$ to make them work I would buy a different set of heads. 800" Intake / Exhaust. Port matched and upper port smoothing along with simple bowl work and a good valve job will perk up your engine. Im not real big on that cam either. When you ease the manifold down, the silicone will squeeze out of the gaps at the front and rear. 71" intake valves. 72' or 1. 462'' Intake / . The ProHeader/KMJ Assault/Skip White NKB/RPC/Power Products head(all the same head, sold under individual names) casting is a direct copy of the Dart 200cc Pro-1 The 882 castings are truck smog heads and are junk - the port and chamber layout is horrible, and they always crack. 71 993 Chevy Heads And Chevy 882 Head Specs Comparison. Hey all! I was going to start porting my C8VE heads tonight when I discovered something that I figured I had better ask before I proceed! I bought Fel-Pro 1420 and 1231 SCJ gaskets in hopes of bringing the ports on these The 270 cid v6 (overbored from 262) engine made 301 fwhp, which would be ~390 fwhp on an equal-spec ported 350. i just swapped a set of 87 350 TPI heads in place of the stock 882's on the 350 in my 74 Monte, and the later model heads Most do. 882 heads are THIN castings that provide about average SBC OEM performance. 479" gross lift and need's . 5 rockers . 02 & 1. The '72 LT1 used 916 Big valve 76cc low CR heads aswell. I've seen 300HP short blocks with 340HP pistons. Save Share Walk away and leave the whole mess alone for 24 hours, then tighten all bolts down to torque spec in sequence. During their visit to the shop the machinist found a crack coming out of the seat of one of the exhaust valves. 040 over, needs to honed and have a crank put in it. i was looking at comp cams xtreme 4x4 cam with, 262° Intake / 270° Exhaust, Duration @ . IMCADW. 6 is the best 1/8 run 456 crank hp is Wat my heads can support according to a Flowbench! I currently have 882 smog heads on the engine. 525 springs port and polish by buffulo racing fresh not run since rebuild $550 option 2. can my heads except this 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 am retired, I have plenty of time to grind away for entertainment. Top. You can fight with the smogger heads with porting and bigger valves to get more than 300 hp, or use Vortecs and stab a cam in to make a dirty 400 hp. Actually if you could get pics of a ported set of 882's 624's or 461's thatd be I have done a couple mild 350's where I pulled the 882 heads and did a home-porting job. Best I can find is a fairly consistent >200cfm rating. 60 valves, guideplates, 76cc chambers, 151cc intake runners. EDIT: This post describes just how good the factory L98 head castings are now, after 10+ years of tweaking to the casting (backcut valves, smooth radii etc). 600 lift even stock vortec heads with some port and bowl clean-up should flow about 230 cfm at . 50 The way I look at it that 11 CC dome is just right, especially since unless those 882 heads have been milled they are always larger then 76 CCs, and especially after a valve job has added 1 Cc or more. mvj yhevc ahjqri btxkpg sls zbsiqn lrsdt wdta gujqv hym