- Flywheels are CNC machined from heat-treated, closed die, steel forgings, and are stronger than cast iron or late style steel flywheels
- Dynamically balanced and fully assembled with premium quaility S&S mainshafts and heavy duty 7.440" connecting rods
- This 4-1/4" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in S&S 80" SH80 engines with alternator style crankcases for 1970-'84 HD big twins
- May also be used in 88" engines with 3-5/8" bore cylinders
- Can be used to overhaul an S&S engine or to build a custom engine using similar crankcases and pistons
- Made in the U.S.A.