Crankshaft
Heavy crank. Used with early heavy pistons. Except balance shaft engine. Forg. # 480,640,865,5480,5865,8640,10055480,10105865,4088640. Doesn't repl. Forg. # 255. Has no balance hole drilled by # 1 rod journal.
Crankshaft
Lightweight crank used with late style light pistons. Includes balance shaft engines. Forg. # 480,685,5480,10055480,10105865. Does not repl. Forg. # 255. Has a balance hole drilled by # 1 rod journal.