maksik7

Hey guys,

I recently blew the motor in my TA, and now I started ripping into it. The previous owner told me it was a 350 with '69 Chevelle 350 Heads on it. However when I pulled the valve covers and ran the casting number (333882) it came out as a "70-76 400cid emission heads". Now these are 76cc heads.

I am planning on rebuilding the 350and looking for at least 350HP/350lb ft, do you guys think tha these heads with the proper cam will be able to make a surpass this figure?

P.S. My pistons are 40 over forged dished pistons (no money to get replacments so they are staying) so the compressions with them and the 76cc heads will be about 7.7.

Thanks,
-Max

Willie

iTrader: (1)

I feel you'll have a much better response on the Tech / General Engine board.

Willie

flyin89

iTrader: (7)

Even angle milling the heads would only get you to 8.75 to one(if that) you need flat tops if the cylinders look good no ridges on top. You could get away with ball honing the cylinders and installing flattops 345np ($7 each at herbert performance) + angle milling with a .050 and flatmilling the head to 67cc should give 9.6 compression with a regular .039 felpro gasket.

RB83L69

NO, I don't think there's any way you're going to crack 300 HP with those heads. They are trash of the lowest order. They came on both 350s and 400s. They are a big part of the reason why mid-70s 350s only put out 170 HP, along with the 929 cam those all came with.

Throw them in the garbage where they belong, and get some decent heads. Don't spend one penny on them, not on milling them, porting them, putting valves in them or whatever, it is money down the drain.

Catch me some time when I'm in a bad mood and I might tell you what I really think of them.

maksik7

Ok... I take it that these heads are garbage. What heads would you recommend, considering I want to keep the dished pistons?

Will L98 heads work with an appropriate cam to give me my desired goal? How about a Vortec setup? All of this has to come in under 800$ so come on let me hear your suggestions. (include a matching cam too, if you want)

Thanks,
-Max

flyin89

iTrader: (7)

I disagree that the heads are incapable of 300 hp. However I do agree that if they are in need of guides valve job milling etc. the price could match a set of vortecs. My Idea of a good low dollar head is the ones most here are pitching which are factory 350 TPI heads they will raise your compression and have better chambers than the 882's(you should be able to get these for lil to nothing). Now the second choice and more expensive is the vortecs $500 + the intake $179 + a comp cam (anything around 216-224@.050 with under .450 lift will work fine)$135 cam and lifters. so theres your $800 gone and you still need gaskets oil filters etc. $100 misc. but done right would easily make 300 +hp.

RB83L69

I've been there and done that too many times to even hallucinate that those smogger heads are capable of anything remotely resembling performance. Back when that was all there was, and everybody was trying to put dome pistons under them and ported them until they cracked, we all learned that there was no way to make a car go fast if it had those. You put those on your car, you get beat, every time. I have thrown more sets of them in the trash, literally, than I can count; if someone were to show up at my door with a set of them, I would almost be willing to pay them not to leave them at my house.

Almost anything else would be better. Even the better 305 heads like 416s would be a better choice; they can be made to flow about the same if not better, and have 18cc less chamber, so you can actually get some compression. About the only heads that would be worse than 882s are the 267/305 heads that came on 2-barrel motors especially in vans and stuff in the late 70s and early 80s.

1991tealRSt-topGuy

i just threw my set of smogger heads off a 78 350 truck in the garbage