S&S Cycle 91-9012 S&S Cycle 66-84 BT 3-31/32in Stroke 3-7/16in Bore 9.0 To 1 Compression Cylinder Kit - Gloss Black

This kit is intended to replace the cylinders and pistons of a 74" shovelhead engine and increase the compression ratio to 9:1. Compatible with stock or S&S cylinder heads.
Kit includes S&S 3-7/16" bore high tensile cast iron cylinders, 3-7/16" bore forged high compression pistons for 74" (3-31/32" stroke) engines with rings and wristpins, head gaskets, S&S stainless steel head bolts with washers, base nuts, base gaskets

Fitment

Year(s)	Make	Model Code	Model
1966-1984	Harley-Davidson	—	Big Twin