This 3-5/8" big bore kit may be used to replace the cylinders and pistons of an S&S SH98 engine or a stock HD® shovelhead engine that has been upgraded with an S&S 98" Sidewindert® kit. Stock crankcases must be bored to accomodate the 3-5/8" bore cylinders.
The kit includes S&S 3-5/8" bore cylinders, 3-5/8" bore forged pistons with rings and wristpins, head gaskets, base gaskets, exhaust gaskets, and instructions. Compression is 8.9 :1. The cylinders are longer then stock , so longer pushrods, and manifold must be used.
Crankcases must be bored to accept larger 3-5/8" bore cylinders
This kit must be used with small diameter flywheels.
Not legal for sale or use on CA or EPA pollution controlled vehicles 1978 and later.
Cylinders in this kit are longer than stock - a longer manifold must be purchased separately
Frame clearancing may be required due to the longer than stock cylinders in this kit.