These 3-1/2" +.010" bore high compression pistons fit 1979-'84 74" HD® big twin engines, producing 9:1 compression with stock unmodified cylinder heads.. 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. S&S® will fit these pistons to your existing cylinders (when purchasing new cylinders, pistons can be fit to them as an option).

This Part Fits:

Year	Make	Model	Submodel
1979-1984	Harley-Davidson	FLH Electra Glide	Base
1980-1984	Harley-Davidson	FLHS Electra Glide Sport	Base
1984	Harley-Davidson	FLHX Electra Glide Special	Base
1980-1983	Harley-Davidson	FLT Tour Glide	Base
1981	Harley-Davidson	FLTC Tour Glide Classic	Base
1982-1983	Harley-Davidson	FXR Super Glide II	Base