thx for the responses guys this is actually a MP 500 shortblock assembled at cummings when the where building MP crate engines.PN#5007665.forged crank and eagle h-beams but hyperutetic pistons.i was thinking if i could get a good deal on it i would replace the pistons with some nice forged units.just didnt want to buy it and find out the block wont go any bigger.sonic checking is probably out of the question until i purchase it and dissassemble.just wanted a heads up on any potential BS i might encounter.