Im trying to figure out some info on the 350 i have in my camaro. It has all been rebuilt but id like some specs on My heads and block. Ill give you the number i have. There are a bunch i wasnt sure which ones you need.

Block:

GM20 3970610 The 6 could be a zero im not sure, but it looks like a 6.

Heads. This is from under the valve cover.

Drivers side head:Gm18t

Passenger:A126
333882
GM25


Any info on this would be great, stock HP, what it came from anything. THanks

 

It's a 0, not a 6.

Very very very common 4" bore block from the 70s, maybe THE most common one. Came in cars, trucks, vans, boats, and everything else. Was used in everything from 69 Z28 302s to phone company vans, and everything in between.

Typical smogger heads. They came on the mighty 165 HP 350s of the mid 70s among other things. Nothing with over 185 HP though that I can recall. A126 = the 12th day of the Ath (1st, Jan) month, in a year ending in 6 (probably 76). That might be the most common SBC head casting in existence.

So you've got a bunch of very usual SBC stuff. Nothing out of hte ordinary in any way.

Impossible to guess how much power you're making, without knowing alot more about other things (pistons, cam, head work, exhaust, etc.). However, most likely, not more than 240 HP.

No way to know what any of it came from. Well, I take that back: it came from a GM product. No way to know whether it was a car or truck, what kind of car, whether any of it was underneath a 2- or a 4-barrel carb, etc. Not that any of that makes the slightest difference now.

 

Ok Thanks very much for the info. Just what i wanted to know.