im doing some work for a kid and we are looking to up the comrpession some more, he has a smog block with 882's, how much should i mill them to get somewhere around 10:1

mike

I doubt you can get to 10:1 with 882 heads. You'd have to mill them to about 65cc from 76cc. That's a bunch and even the early heavy 882's won't go that far (about .066"). About the best you can do is use a shim head gasket. Popup pistons would up the CR.

Be careful here. I'm not sure how much you have to mill off, but the 882s may or may not have enough "meat" to mill off. Make sure you get them sonic tested (do they do that for heads?) to make sure you don't have an xtra lightweight casting.

Assuming a 4.00 bore and 350ci, .02 down the hole and flat top pistons, you'd need to get them down anywhere from 60 to 66cc depending on gasket thickness

how far can i take the 882 safely? and what quench gasket should i shoot for?

mike

For the work needed to get to the higher compression ratio, why not get a set of Vortec's off ebay and have your cake and eat it too?


Just a thought.

I'm not sure what you can take off of 882's, maybe Wolfplace will chime in.

But assuming your pistons are .02 or MORE down the hole, you should get a .015/.018 thick gasket IF your deck surfaces are nice and flat. If not, there's a .028 gasket that should work.

personally, i would never own 882s. but the person im doing work for would

.028 gasket we will go with for the head gasket. but id still like to mill the heads, this kid is looking for alittle more outta the car, and id like to surprise him

mike

How much cam are uoy putting in it? Advancing the cam can make up a bit for low compression.

Are the heads early heavy castings or later lightweight castings?

i know the lift of his cam is right around .487 thats all i know, and as for the heavy/lightweight, im not sure either, he just said he has a pair he would like to use if possible

I'm going to use 882s on my 81 Malibu, mostly because I'm cheap, but I also feel that with a little help, they aren't bad heads. These are the heavy castings, converted to screw-in studs, and I spent some time porting them.

If you want to surprise him, the Vortecs should be good for, I don't know, 30-40 horsepower over the 882s.

Look at where the lower, short bolts go. Heavy castings have only 2 scallops for the dipstick. Light castings have several more scallops between the bolt holes. If they are light castings, I wouldn't use them at all for any kind of power buildup.

Just a guess, but with that much lift the cam probably has quite a bit of duration. It will like some compression. You need to get the cam specs to see if the Vortecs, or other 64-67cc heads, are a good match.

882's are not the lightweight castings but,,,,
to get to 64cc'c will require an angle mill of about 100 thou (which is doable BTW) & then the attending intake face correction, bolt hole correction & spot facing of the bolt holes & you still have a basically crap head for performance use so my question would be,,, why???

You are looking at probably $300+ in machine work unless you know someone who works for free just to get more compression & this is assuming the heads are in good shape to begin with.
Plus, if this is a 350 you still may not get to 10.0 depending on what piston you have.
I'd spend the money on a set of Vortec's & a new intake & you should probably pick up 30-50HP over the reworked 882's
Very hard head to beat for the money especially with a smaller cam.
They will outflow a set of GM bowties to about .300-.350 lift on the intake side.

I have these on my car. Also had them on the previous engine in my car. My dad did some heavy porting on them and they seem to work pretty nice. They are referenced as being an "intermediate" performace head. I have compression down around the 9-1 range though since mine is a daily driver.

For a street type car they are a pretty good deal but if he is very performance oriented try to talk him into something else.

I'm getting some pretty decent power for such a mild build. We have about $800 in the motor, its pushing my cars 3860 lb ass to 77.3 in the 1/8 without any strip tuning and 87 octane. Then I turn around and come home for the strip getting a tolerable 21 MPG