Block casting #3970010, bore 4.040, Old Wiseco flattop #6012A4/ CH-1.260 piston, H-beam 6" rods with ARP 8740 bolts, block is aligned with ARP stud kit, GM steel crank, balance rotating assembly with new 6-1/4 PWR fluid damper, new Speedway flex plate, compression ratio with 64cc head about 10.0:1, oil clearance rods .0033/ mains .0030.