Crank: 239 Main, 4.125" Stroke, 2.000" Rod PinRod: 7.000" 4340 Forged H-Beam Rod w/ARP 3/8" Cap Screw BoltsRings: 1/16 x 1/16 x 3/16
NOTE: All flathead blocks must be from 1939-'53, and have 24-stud heads and 2.500" mains.