This is a Gen6 454 block, 4 bolt mains, 6223 427 forged steel crank and the needed rear seal adapter, GM 7/16 Dimple rods, brand new ARP wave-loc bolts, new manley bushings, resized and polished beams, ICON forged solid dome pistons, were 41cc, i had them milled down to 8cc, will provide 9.7CR...