79" Sidewinder<sup>®</sup> 3-5/8" Big Bore Kit for 1986-'03 HD<sup>®</sup> Sportster<sup>®</sup> & Buell<sup>®</sup> Models -Natural Aluminum Finish

79" Sidewinder® 3-5/8" Big Bore Kit for 1986-'03 HD® Sportster® & Buell® Models -Natural Aluminum Finish

Item #: 91-3002
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$855.95
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This big bore kit for 1986-'03 HD® Sportster® & Buell® Models increases the displacement of 883cc and 1200cc models to 79". The kit includes S&S 3-5/8" bore alumium cylinders, and forged 3-5/8" bore flat topped pistons with rings and wristpins, head gaskets, base gaskets, exhaust gaskets, and required hardware and instructions. Crankcases must be bored to accept the larger 3-5/8" cylinders, and rebalancing of the stock flywheel assembly is highly recommended. Cylinders are stock length, so there are no chassis clearance issues, and stock length pushrods and manifolds may be used.

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This kit has stock height cylinders and will fit Buell® motorcycles. Compression ratio depends on cylinder head type used. If stock heads are used extensive cylinder head modifications must be performed, making compression ratios completely dependent on final combustion chamber volume.