S&S, Evo stroker piston set (OEM heads). +.020" - 84-99 Evo B.T. with 4-5/8" stroker flywheels (NU) 943231 Hidden breathers are O-ringed at

Hidden breathers are O-ringed at the heads and exit out the mouth of the throttle body to provide efficient engine breathing

Replacement Rear FenderRaw steel finish

Includes gasket for front & rear cylinder head

Pipe will clear e-start wraparound oil tank

S&S, Evo stroker piston set (OEM heads). +.020" - 84-99 Evo B.T. with 4-5/8" stroker flywheels (NU) 943231 Hidden breathers are O-ringed at89". 3 1 2" stock bore x 4 5 8" stroke. Used with stock cylinders and heads in combination with 4 5 8" stroker flywheels. Converts the stock 80" (1340cc) Evo B. T. to 89" (1459cc). Approx. 9. 25: 1 CR. Kits include forged pistons, wrist pins, wrist pin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It