[Sport/Truck]

Originally Posted by Aarons72s

4 barrel most likely 4 bolt mains. 2 barrel most likely 2 bolt mains. Ripped apart a 71 chevy with original 350, 2 barrel, and it was a 2 bolt main engine.

Originally Posted by BUDDY

I heard once a long time ago that all of the GMC's came with 4-bolt mains, 'cause GMC only sells trucks, they would go a little out of their way to make sure they could justify someone buying a GMC over a chevy. FWIW.

In my blazer, with a 2-barrel original 350, it was a 2-bolt main.

Personally, if I were going to build a small block from stratch I'd prefer the 2-bolt because of this. When you are doing a full rebuild on an engine, it is totally worth it in my mind for the added assurance that this little mod would provide. Granted, it's a 3-400 dollar upgrade, and maybe it's not really needed for a truck motor, but when you decide to go all out with the supercharger or nitrous, you sure wouldn't have to worry about the bottom end here.

Later,
Buddy

I dropped my pan today to get a woodruff key out, re-seal etc. I also wanted to know if it was 4 bolt main or not. It is infact a 4 bolt.
So here's what I have: GMC with original 350 & 4 barrel carb.
s/t