103" Sidewinder<sup>®</sup> Big Bore Stroker  Kit for 1970-'84 HD<sup>®</sup> Big Twins - GlossBlack Finish
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103" Sidewinder® Big Bore Stroker Kit for 1970-'84 HD® Big Twins - GlossBlack Finish

Item #: 91-9140
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An S&S 103" 3-5/8" Sidewinder big bore stroker kit is an economical route to a larger displacement engine. This kit contains nearly everying needed to take a stock 74" or 80" HD® shovelhead engine up to 103" displacement. This kit includes S&S 3-5/8" bore high tensile cast iron Sidewinder® cylinders and forged pistons with wristpin and rings, a 5" stroke small diameter dynamically balanced S&S flywheel assembly, complete with S&S heavy duty connecting rods and mainshafts, S&S stainless steel head bolts, base nut, S&S adjustable chromoly steel pushrods, head gaskets, base gaskets, exhaust gaskets, and an S&S heavy duty top motor mount. Compression is 9.7:1

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Crankcases must be bored to accept larger 3-5/8" bore cylinders IMPORTANT: 1977-’89 style pinion gears, spacer, and nut are required when installing S&S flywheel assemblies. For installation in 1990-’99 or scratch built engines, order S&S Pinion Shaft Conversion Kit 33-4148 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.

NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution controlled motor vehicle.