S&S, Evo stroker piston set (OEM heads). +.020" - 84-99 Evo B.T. with 4-5/8" stroker flywheels (NU) 3578 Bottom of housing comes with

Bottom of housing comes with 2 x M3 threaded mounting holes

Made from 52100 aerospace quality Timken® bearing stock

bonded to a hardened aluminum base

Models with passenger footpegs require the use of PART #s 1621-0392

Handlebar Type: Z-Bars

S&S, Evo stroker piston set (OEM heads). +.020" - 84-99 Evo B.T. with 4-5/8" stroker flywheels (NU) 3578 Bottom of housing comes with89". 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