91-9001 | 88" Sidewinder 3-5/8" Big Bore Cylinder Kit for 1979-'84 Big Twins - Gloss Black Finish boot clips Celebrate classic biker style with

Celebrate classic biker style with this 4" arc-shaped patch featuring bold Harley-Davidson® lettering in yellow and "Motorcycles" in white script

® America's Stars Knotty Band™ Head Wrap

Detailed CNC machining from the edge of the rim to the center of the wheel hub

the green toe & heel define the reinforced support

91-9001 | 88" Sidewinder 3-5/8" Big Bore Cylinder Kit for 1979-'84 Big Twins - Gloss Black Finish boot clips Celebrate classic biker style withS&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,