Thanks! OK, I cleaned the block up pretty well, it's time to order rings and a gasket kit. It looks like the pistons are stock, they measured about 3.49" at the bottom. The rings all seemed the same, about 0.11" and 0.18" for the compression / oil rings
The rings on piston six were siezed though, kinda tough to get out! The oil trough had a hole in it so I guess it wasn't getting oil.
I made a gallery submission, here are a few photos:
Truck Engine removed Block
