Big Twin Note: Models late 1981-early 1983 require the late 3/4"-20 nut ZPN235833 (OEM 24016-80)., Fits Evolution 1981-1999, must be used with 1981-1989 style aftermarket stroker flywheels and 1993-1999 nose cone cover, pre-1990 pinion gear and pre-1990 oil pump drive gear, and late 3/4"-20 nut ZPN 235833, Jims USA (OEM 24016-80)
Jims USA and Eastern make these high quality pinion shafts from high quality aircraft alloy steel. They are the finest on the market and are used by the worlds most famous engine builders. Highly recommended for High Performance engines.