These 3-7/16" .0310" bore, low compression stroker pistons are part of an S&S stock bore stroker kit for 1936-'84 HD® big twins, and are designed to be used in conjunction with S&S® stroker flywheels. Flywheels of the following strokes may be used for the following displacements: 4-1/2" stroke - 84" @ 7.3:1 compression 4-5/8" stroke - 86" @ 8.0:1 compression 4-3/4" stroke - 88" @ 9.0:1 compression These pistons are normally used in stock HD® cylinders, and must be purchased separately, based on the required piston oversize. The modern alloys used in these pistons, coupled with the advanced skirt profiles, allow them to be fit tighter resulting in low engine noise and long engine life. In the past, this could only be achieved with weaker cast pistons. Cylinders are available from S&S® for 1941-'47 and 1966-'84 models. S&S® offers machine shop services through the S&S® Service and Speed Center. New pistons can be fit to your existing cylinders for a reasonable charge.

This Part Fits:

Year	Make	Model	Submodel
1941-1947	Harley-Davidson	EL	Base
1941-1962	Harley-Davidson	FL	Base
1953,1955-1959	Harley-Davidson	FLF	Base
1958-1959	Harley-Davidson	FLH Duo-Glide	Base
1970-1978	Harley-Davidson	FLH Electra Glide	Base
1955-1957	Harley-Davidson	FLH Hydra-Glide	Base
1955-1959	Harley-Davidson	FLHF	Base
1971-1978	Harley-Davidson	FX Super Glide	Base