These forged, 3-5/8" big bore flat topped pistons are used in S&S® Sidewinder® kits and Hot Set Up Kits® for HD�� Evolution® big twins with stock cylinder heads and 4-1/4" and 4-1/2"stroke engines with stock diameter (8-1/2") flywheels and 4-3/4" stroke engines with 8-1/4" diameter flywheels. 3-5/8" bore.
Fitment
| Year(s) | Make | Model Code | Model |
|---|---|---|---|
| 1984-1999 | Harley-Davidson | — | Big Twin |
| 1986-2003 | Harley-Davidson | — | xl |
