These low compression 3-1/2" bore forged stroker pistons for 1984-'99 HD® big twins are a low compression option for 89" stroker kits for 1984-'99 with 4-5/8" stroke flywheels and S&S® Super Stock heads. 10.5:1 compression .
+.010".
Fitment
| Year(s) | Make | Model Code | Model |
|---|---|---|---|
| 1984-1999 | Harley-Davidson | — | Big Twin |
| 1986-2003 | Harley-Davidson | — | xl |
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Type Replacement
