Pontiac GTO Forum banner

1 - 2 of 2 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1
Alright so I bought a 79 T/A project to rebuild and restore back in April. The 400 block in it isn't the original but is a YX code block. It runs but it still needs some tuning.

When I bought the car the man gave me an extra 400 engine block with 6x heads for free. I did some research on it and if I'm not mistaken it came out of a 1970 GTO Ram Air III car.
Here's the numbers I found...
Engine Code 0613314 YZ
Block Cast # 9799914
Block Date Code E280
Block Vin 20L110143
The heads have a date code H297 so they aren't original to the block.

So the question I'm getting to is; if I'm not concerned with having original parts anyways, which motor would give me better performance if I were to drop it in my T/A? Thanks
 

·
Registered
Joined
·
235 Posts
Either block will work but you could sell the RAIII block and partly finance the other block build. The 6X heads need more ID or be CC'd to know if they would be worth working on. If you want to build an engine that makes power and you can drive shoot for around 9 to 1 compression.
 
1 - 2 of 2 Posts
Top