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136-Inch Big Bore Kit for Milwaukee Eight Models

S&S Cycle’s biggest big bore kit yet.

Milwaukee Eight big bore kit
S&S Cycle 129/132-Cubic Inch Power Packages for 2017-2023 M8 Engines

S&S is combining its brand new 129- and and 132-cubic inch bolt-in big bore kits with lots of goodies to achieve the ultimate engine build.

S&S Cycle 132-Inch Big Bore Kits for 2017 to 2022 CVO M8 engines

Created specifically for CVO bikes with the unique Black Granite engines.

CVO Big Bore Kit
S&S Cycle Winter Power Package Extended to Feb. 28

Transform your M8 or Twin Cam Harley-Davidson without breaking the bank.

Winter Power Package
S&S Cycle Winter Power Package Returns for a Limited Time 

The ideal combination of performance and savings.

Winter Power Package
S&S Cycle Big Bore Kits

These 129-inch and 132-inch kits for 2017-2022 Harley-Davidson Milwaukee Eight engines are literally huge.

Big Bore Kits
S&S Cycle 590 Cam for Big Bore M8 Models

The new cam is designed to work with their 131-in. stroker kit and other huge bore combinations.

Twin Power Introduces 4.25 in. M8 Big Bore Cylinders

Twin Power M8 Big Bore cylinders are factory fitted for the popular Wiseco Black Edition pistons.

Revolution Performance Releases Milwaukee Eight Big Bore Kits

Revolution Performance introduces a state of the art, all aluminum, nickel silicon carbide plated, bolt-on 124 in. Big Bore Kit for Milwaukee Eight Harley-Davidson motorcycles.

S&S Cycle 4-Inch Bore Bolt-On Bore Kit

S&S has introduced the new Winter Power Package designed to transform a big twin into the monster it was meant to be. Bump 1999-’06 engines from 88ci to 100ci and 2007-’17 engines from 96ci or 103ci to 110ci with the new S&S 4″ big bore kit.