Were 4 bolt block's standard in blazers, I tore mine down today and was suprised to see that it was. It had never been rebuilt before, still had the original bearings and nylon timming gear (well most of it)

I believe so, but i'm NOT a motor head. I was doing some minor research on our orig. truck engines and i THINK they are..

I didnt know if because it was a 4 speed or 4x4 had anything to do with it. Just a thought

I think that's how the truck engines were, not sure.

Most (but not nec. all) truck 350's will be 4 bolt.

Yea that's what i'm talking about ^ cool