I picked up a parts car (86 LB9 Trans Am) that has had the engine swapped to a 350. It was done by a performance shop around 10 years ago but due to circumstances not related to the engine or the car, it only accumulated 20,000 miles on it before being parked. The car is pretty sad and will never run again due to its fuel and electrical systems and interior being too far gone for the effort. The engine apparently ran quite strong. I'm hoping someone can ID the heads from thess pics because I haven't found anything definitive. They are perimeter bolt valve cover and would have to be pre-87 because they used th 86 TPI base. I have the invoice from the engine build but all it says (besides a big parts list) is "Rebuild engine" and "sub 350" (for the 305 it had prior).

Thanks!
GD

 

I could not find anything with that number, 886338X, but the casting symbol "C".........

 

Closest thing I can find is 3986339X, which is what that casting # looks like, minus the leading "3".

It would be an early 70s 307/350 (2-bbl) large-chamber piece.

 

Yeah I saw that one with the 3 in front but I found pictures of a head that had the leading three. I don't get why the three would be missing....

GD

 

Ah, the smell of that lovely 70s GM "quality control"...

 

Nice. Well it looks like they used some really crap heads. Wonder what I'll find inside this unit. I was told it had good power - enough to get it "sideways across four lanes". And that with a 2.77 9 bolt in it....

Heads don't look like power to me.

Block suffix is KO611UKC

I haven't found UKC either.

GD

 

Well a block is just a block... doesn't have too much to do with "power". Wouldn't worry too much about that.

No frankly, nothing in that picture looks particularly like "power" as far as that goes... not a hint of any typical "performance" treatment is visible... they even left the oil splash shields on there. Total dead weight. Probably were re-used stock springs too. Oh well, who knows, not hard to fix most of those malfunctions. I guess once you pop those off and see what's underneath them, you'll have a better idea of what you really have there.

 

https://books.google.com/books?id=pS...20code&f=false

Look at page 186. UKC 83 ElCamino 260 cid DIESEL V-6

You must be reading the code wrong.

 

3986336-'71-350-76cc
3986388-'68-'76-307/350
3986339-'71-307/350-74cc