i just got a set of stock 192s (or did he say 196? i dont remember im new to chevy heads) and i was wondering if they were any good and what i can do to make them better.
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i just got a set of stock 192s (or did he say 196? i dont remember im new to chevy heads) and i was wondering if they were any good and what i can do to make them better.
Look for the casting numbers. I think 8 digits? Somebody correct please if I am wrong. Post those numbers on this thread. Those numbers will provide much needed info about the heads so we can better understand what you have and what you want.:)
ahhhh thank you. ill be sure to get them tommorow
Depending on the year it can vary from 6 digits to 8 digits. I have a small block V8 ID guide book that shows all the numbers.
the only numbers i found was a GM with a 8 under it and the numbers 333882
882 casting heads, 76cc chambers, basicly a common head found on '74-'81 350's. There fairly popular but not the greatest because they have somewhat insufficent flow.
ok, but theyre decent heads and ill use them for now. im gonna open up the intakes and put roller rockers on them.
what else can i do to get them to flow better thats not gonna break the bank?
Yes, there decent for mild builds. you should run flat tops or a domed pistion to get the compression ratio up. with a stock standard dish pistion, it would yield 8:1, flat tops would get you 9:1Quote:
Originally posted by muteboy49
ok, but theyre decent heads and ill use them for now. im gonna open up the intakes and put roller rockers on them.
the kit im going to buy for my motor said it will give me a 8.6:1 CR with the 76cc heads but im putting a bigger cam in it for a 9:1 ish CR
what kind of lift can these heads take?
you can try porting and polishing the ports but without a flow bench, you won't know if you really did anything. you can only do so much to make anything better, after that point it becomes a waste. Run the heads for now, there only good for a mild build and only slightly better with improvements made. A set of aftermarket heads would be a wise investment if you wanted to make the engine better IE: new top end, you could just get like Dart or World Products heads but get them in 76cc so your comp ratio does not change. bottom line, don't put to much effort into the 882's, there only good to a pointQuote:
Originally posted by muteboy49
what else can i do to get them to flow better thats not gonna break the bank?
Quote:
Originally posted by muteboy49
the kit im going to buy for my motor said it will give me a 8.6:1 CR with the 76cc heads but im putting a bigger cam in it for a 9:1 ish CR
You will need ither a flat top or a .100 dome to meet the 9:1 requirement otherwise, it is a waste to have the big cam. you can shave the heads a little and that will help but then you need to re cc the heads to get an accurate comp ratio calculation. The heads can be machined to fit almost anything I think. I'm not shure with there stock form.Quote:
what kind of lift can these heads take?
good point but im definitely getting roller rockers and opening up the intake
"im gonna open up the intakes"
If you start grinding in the ports without having a great deal of experience and knowing exactly where to remove material, you'll most likely turn a decent set of heads into junk.
"what else can i do to get them to flow better thats not gonna break the bank?"
Just do a 3-angle valve job on 'em and call it good until you can afford a better set of heads.
" the kit im going to buy for my motor said it will give me a 8.6:1 CR with the 76cc heads but im putting a bigger cam in it for a 9:1 ish CR"
From the way you've worded this, I can't tell if you are thinking the cam will change the c.r. or not, but it won't. If you're saying that the cam you want will work with a 9:1 c.r., it will also work with a c.r. of 8.6:1, they're not that far apart.
the pistons in the kit are flat top, www.SDPC2000.com part no, MKF630C
Something's wrong. My Scoggin-Dickey catalog shows the MKF630C kit as using Sealed Power forged pistons for $529.99, but the website shows a price of $319.95. My catalog shows hypereutectic piston kits for $319.95 @ a c.r. of 8.3:1 and a 8.0:1 kit with cast pistons for $289.95.
hmmm damn, i knew it sounded too good for 320
Well I am hoping my 882 heads from a '76 Corvette will give good performance and reasonable mpg since they originally appeared during a previous gas crunch.
http://chevyhiperformance.com/techarticles/41598/
There is an article giving specs and comparisons of the 882s to other heads. I originally became interested in an article in Hot Rod, December 1995 which had a budget buildup using a H.C. Master Kit rebuild with flat top pistons and an Edelbrock Performer intake to obtain 303 H.P. at 5000 rpm with 295 ft. lb. at 1500 rpm using a rather long cam (in my opinion) which was their standard hot rod grind with 280/290 duration and 0.443/0.465 lift using the 882 heads and standard 1.5 (?) rockers.
I opted for a much shorter "Street cam" from Crane (194/204 @0.050 and 0.398/0.410) to get mileage but then I added 1.6 roller-tip rockers to get slightly longer duration and a little more lift but mainly some faster valve action at low rpm for torque while in OD high gear. I am using the intake ports unchanged but shaved the heads to get 73 cc chambers and paid (a lot) to get the exhaust ports smoothed professionally along with a 3-angle valve job. OVerall it was only $300 to rebuild the heads with the valve job but the extra $200 for the exhaust porting meant I could have bought Vortec heads for the same amount. Anyway I will run these heads for a while and check out the performance and mpg with the OD trans. The main point about the 882s are that you probably run a risk porting the intakes as they are reported to have very thin walls. The exhausts can use some smoothing however. Also note that the flow test shown above on the link indicated that not much is gained in flow after about 0.400" lift, so maybe that is why the longer cam worked holding the valve open longer. Maybe I should just have bought that cam, but I anticipated the rise in gas prices and now I can cut back to 1.5 rockers on the intake if I really need mpg. Also note that the small runners of the 882s restrict high rpm flow BUT help make torque at low rpm.
Don Shillady
Retired Scientist/teen rodder
If this is a street motor, there's nothing wrong with cast pistons. Bore the motor 0.030" and hone it to fit your new pistons. Then bolt the crank (oiled) into the block with the bearings you'll be using and assemble one piston/rod assembly without rings. Use this one assembly and bolt it onto the crank, one at a time on cylinders 1, 2, 7 and 8. Rotate the crank to bring the piston up to top dead center on each of the four corners of the block (1,2,7,8) and measure the top of the piston to the top of the block deck. Record each measurement, then unbolt the crank and bearings and have your machine shop cut both decks of the block so that the pistons will be at zero with the deck. Use a head gasket with a compressed thickness of 0.039". The resulting c.r. will be 8.90:1 with the cast, dished pistons in your MKP630C rebuild kit, $289.95. Tell Scoggin-Dickey that you want a cam with 212 to 216 degrees duration at 0.050" tappet lift.
with a CR and a cam that size will this motor make some decent power numbers?
and how big are the cams for these kits? do you tell them what you want?
It's not gonna be a world beater, but it will make good power with good vacuum, run on crap gas with full ignition timing, and work with a stock converter and tall rear gear.
Yeah, tell them the cam you want. If they won't supply the cam you want, tell them there are other places you can buy kits.
the guy i got the motor from just told me to get a 488 cam will they have that?
Is this same guy gonna help you change the cam to a milder grind after you find that a cam that big won't pull the hat off your head with low c.r.??? :eek:
Hi, please keep me posted on how you like the 882s and what cam you finally used. I've just bought two sets of 882 heads really cheap and wanted to have one set ported and a 30 degree seat cut in and see what difference it makes in a daily driver. I'm concerned about MPG, because I live in Germany where gas is over twice as expensive. I cracked one of my 041 heads, so thats why I needed new ones and the 882s were the only ones I could find here. 882s are said to be good for low end torque which is what you want in a daily.
Please answer this post on what cam you put in in the end and how well it works. Thanks!
Mad
This sounds like a dog chasing its tail. You might want to back up and start again by telling everyone what you are doing with the heads. What kind of vehicle are you putting it in, the tranny, the induction system,etc.
Are you racing, pulling a boat, four wheeling, drag racing, what?
Your end result goal determines where you start. Then, these guys can be more precise with their answers. Now, let's try again, OK?
right now im just rebuilding a 355 with these heads. i plan on it going into a 3rd gen camaro. as far as induction, holley 750 with a stock 4 barrel intake manifold. the motors gotta be streetable but i plan on racing with it occasionaly
I think bolting on 64cc Vortec heads would be alot more bang for the buck. JMO.:)