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Author Topic:   GM stock 882 heads
Dirt Forum Racer

Total posts: 77
posted November 29, 2001 10:59 PM
just a quick question.
rules at my track say i have to run
GM stock cast iron heads #882.
does anyony know were to find this #
on the heads or what to look for.

Dirt Freak

Total posts: 430
posted November 30, 2001 12:13 AM
Take the valve cover off and in between the lifters somewhere in the middle there will be a set of numbers I beleive it would be 333882

[This message has been edited by ryan (edited November 30, 2001).]

Dirt Freak

Total posts: 298
posted November 30, 2001 07:51 AM
this is a very common casting no. considered to be low preformance "smog" head hence your rules its the promoters attempt to save you all $$$$$$ i wish we had promoters like that here! P.S. ihave alot of these heads cheap contact me if interested they did make them with 1.94 int and 1.72 int and 400-350 versions

Dirt Maniac

Total posts: 141
posted November 30, 2001 09:14 AM
The 882 heads aren't bad, I ran a set on a street car. If you shave them much more than 20 thousandths (get u to 72cc) you will have to shave the intake side of the head also. Those castings are 76 cc heads and just for reference a two valve piston and those heads shaved 20 thou. will get about 9.3:1. But even at 20 my itake (foul spark plugs/ pull the intake and see oil in the runners)was border line sucking oil into the intake ports. But you maybe be able to cut the intake holes oblong to fit better. All this depends how the block is shaved.

Dirt Freak

Total posts: 458
posted November 30, 2001 10:01 AM
hughes, Did you angle mill the head or flat clip the head?
I believe you stated flat don't need to correct the intake side of the head or the head side of the intake........
What ever amount you take off the deck of the block or the flat clip of the head needs to be taken off the ends of the intake.....

You know where they put the STOCK cork gaskets on the ends of the intake.....that area needs to be shaved off 1.8 times the amount off the deck of the block or the flat of the head......

.020 off the head would be .020 X 1.8 = .036
.030 off the head or deck .030 X 1.8 = .054
the .036 or .054 in these examples would need to be taken off the ENDS of the intake, or the top of the block where the intake sits.

Put the intake on without any gaskets, take a feeler gauge and slide it in the ends where the cork gasket would go.....You need to have minimum of .018 clearance in this area.....if you don't you can take a grinder after the intake...............don't just measure the center, measure out toward the heads on the sides........slide that feeler gauge from side to side........then check the other ind the same way..........

If you don't have enough clearance the intake will bottom out in this area and leave the intake gaskets loose......sucking oil/air from the valley of the motor.

If You already know this that's fine, I'm SURE someone out there will benifit from this information.


Dirt Forum Racer

Total posts: 77
posted December 28, 2001 09:59 PM
thanks for the info.
I checked and I have the wrong
heads. I ran the whole season
this year with them(not knowing)
and passed all the teching,but
I still want to be legal just in case.
Thank's for the offer ford5,I have located
some locally,but I will keep you in
mind if I need.

Dirt Forum Champ
Total posts: 1565
posted December 29, 2001 01:11 AM UIN: 54865418
hey yaz if you go to imca,com and click on the hobby stock rule they have a list of all the casting numbers that you can run with flat top pistons and still be 9-1 compression maybe you could bring that up in a rules meeting if you have one would save even more $$$$$$$$$ and i'm sure that why they are having you run those heads to keep compression down. we switched to a 360 ci 9-1 comp rule a few years ago and it saved the class now anybody has a good shot not just the couple guys with the 12-1 406's

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