Quote Originally Posted by Bobaloo
Hi folks, I am knew to the page, so forgive me if this has been covered before.

I just bought what apparently is a GM crate motor, out of a 69 Chevrolet truck.
The block is a 3970010, the seller knows it has 4 bolt mains, and the heads read 3998993, which from all my sources should be 75cc Mexico Goodwrench heads. The entire engine was corporate blue/green, with a Q jet and not much smog stuff and plumbing. The water pump must be a "long" pump, because it does not look like the pump that was on my 58 283, 64 327, etc.

Somebody tell me what I have. I bought it for the block, so really the rest is icing on the cake, but I sure wish it had 69 era heads on it.
Welcome,
Your 993 heads are a good street open chamber head.
If you want to go faster you have come to the right place.