Engine

Active filters
High-quality, fuel-resistant cover seal engineered for long-term reliability. Made in the USA.
Stock-height long-block replacement for Evolution engines. Includes performance heads, pistons, valve springs and a 508 camshaft. EFI compatible; fuel/ignition sold separately.
Durable Bolt-In Valve Stem with metal bottom and rubber seal for optimal performance.
High-quality replacement parts for valve stem kits to ensure optimal motorcycle performance.
High-quality replacement parts for valve stem kits to ensure optimal motorcycle performance.
Carbureted V80 assembled engine that fits stock '84–'99 Evolution Big Twin frames; upgraded S&S carburetor, cam, heads, and single-fire ignition.
Bolt-on performance kit with bolt-in cams and premium tappets. Easy installation with no machining or rebalancing. Uses stock heads, pushrods, and fuel system.