S&S CYCLE Flywheel - Twin Cam 320-0354

If you're running a Twin Cam motor at higher RPMs or building a performance engine, stock flywheels become a liability—they're prone to failure under sustained load. The S&S Cycle 3-piece flywheel assembly eliminates that risk with a robust design engineered for strength and reliability. Built from 4140 steel with a larger 1.671" crankpin diameter, this is the solution for serious builders who demand durability without compromise.

Installation is straightforward: these flywheels bolt directly into stock crankcases with zero modifications required. When paired with a Timken bearing conversion, you get a bulletproof drivetrain foundation that handles aggressive power levels. Made in the U.S.A., this is the flywheel spec that separates amateur builds from professional-grade work.

• Material: 4140 steel
• Design: 3-piece assembly
• Crankpin diameter: 1.671"
• Integral main shafts
• Timken bearing compatible
• Fits: Twin Cam motors
• Installation: Bolt-on, no mods
• Origin: Made in U.S.A.
• Part number: 320-0354