Vast improvement over stock flywheels, which shift out of true under heavy loads. Heat-treated 4140 material is 114% stronger than stock, eliminates thrust washer. Larger 1.671" crankpin, increased cross-sectional area for increased crank-pin clamping force. No welding required. Integral mainshafts, truer flywheels and less vibration.
- Made in USA
- Strokes longer than stock will require S&S® piston oiler set P/N 493791
- 07-17 stock rod length is 7.659"
- Stock pistons in 2007 and later engines require rods with tapered wristpin ends