the turbo blocks have oil squirters that spray the pistons to keep them cool - the oil galley can be tapped to add them. The intercooled motor crank was nitrided to improve strength and wear. The oil pump and pickup are also different, but the rods are the same forged rods as the truck motor. The base block is a truck block. If you weren't in WA, I have a spare block that 1 cylinder needs a sleeve I would give you. I got it as part of a deal of all the parts someone had for a conquest - this block was supposed to be ready to go, just assemble. Upon block bore checkout, the builder happened to check the bores at a 45degree angle, and found one of the cylinders was .030 in one spot, so I built another block I had instead.