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Big Bore Kits

Parts and Accessories

S&S Cycle Big Bore Kits

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


S&S Cycle loves raw, unadulterated, thumping, makes-your-heart-skip-a-beat kind of power, and that’s the very stuff the company specializes in. This obsession with power is further proven out by its latest efforts for the Milwaukee Eight powered Harley-Davidson models. Its bolt-in 129/132-cubic-inch (that’s well over 2000cc for you metric folks) Big Bore Kits are just this side of monstrous, taking the stock engine from a mild mannered 107 cubic-inch to a fire breathing 129 cubic-inch or the 114 cubic-inch models to 132 cubic inches of tire-melting power. The latest is a 4.32-inch bore and is slated for 11:1 compression ratio, so it’s happy with pump gas but will still complement a high-lift cam. No case mods, no engine removal — just a massive set of jugs designed, tested and manufactured here in the U.S.  For more info and detailed specs, check out

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