S&S CYCLE 88" Sidewinder 3-5/8" Big Bore Cylinder Kit for '79-'84 Big Twins - Gloss Black Finish - 91-9001

Installing this 3-5/8" big bore kit will increase the displacement of stock 80" HD^® shovelhead engines to 88" using the stock 4-1/4" flywheels. This may also be used to build an 88" engine in 74" shovelheads if a 4-1/4" stroke flywheel assemble is also installed. The kit includes S&S 3-5/8" bore cylinders, 3-5/8" bore forged pistons with rings and wristpins, S&S stainless steel head bolts, base nuts, head gaskets, base gaskets, exhaust gaskets, and instructions. Compression is 7.5:1. The cylinders are stock length so stock length pushrods and manifold may be used.

• Cylinder and piston kit can be used to build an 88" engine, or to replace the cylinders and piston in an engine with an existing S&S stock bore stroker kit
• Includes 3-5/8" bore high tensile cast iron cylinders, forged pistons with rings and wristpins, head gaskets, stainless steel head bolts with washers, base nuts and base gaskets
• 88", 7.5:1 compression
• Can be used in engines with 4-1/4" flywheels
• Made in the U.S.A.
• Crankcases must be bored to accept the larger 3-5/8" cylinders and stock flywheel assembly should be rebalanced.

Fitment Guide

Specs