Description

S&S Cycle 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, exhcaust gaskets, and instructions. Compression is 7.5:1. The cylinders are stock length so stock length pushrods and manifold may be used. Install Instructions Download
Additional Install Instructions

FITMENT DISCLAIMER

Fitment information is provided as a general reference only and is not guaranteed for any motorcycle, whether stock or modified. Compatibility may vary by year, model, and individual configuration.

Customers are responsible for verifying fitment prior to purchase. House of Harley-Davidson assumes no liability for purchases made based on incorrect or unverified fitment information.

Please TEXT 414-282-2211 with any questions before ordering, or use the chat below.