Performance Kits

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.

Complete bolt-on big-bore kit that raises displacement without case machining. Includes cylinders, forged pistons, upgraded oil pump/cam plate, valvetrain hardware, and all gaskets and bearings for installation.

Complete big-bore kit to convert 114"/117" water-cooled M8 engines to 132" with serviceable components and retained engine height and serials.

Complete 132" engine performance kit converts 114"/117" oil-cooled M8 to 132" with big-bore cylinders, performance-matched 550 cam, adjustable relief valve, and serviceable components.

Complete kit to convert 114" or 117" oil-cooled M8 engines to 132" displacement while retaining stock height and serial numbers. Includes adjustable pressure relief valve, S&S valve springs, big-bore cylinders, MLS head gaskets and a performance-matched 550 cam.

132" high-compression kit fits 114"/117" motors with a 4-1/2" stroke flywheel only. 136" big-bore requires an S&S 4-5/8" stroke flywheel (sold separately).

• Converts stock engines to 124" for non-balanced Twin Cam models.
• Complete kit with S&S heads, pistons, cams, tappets, pushrods, rocker arms, hardware and gaskets.
• Made in the USA; EFI recalibration required. Fuel or ignition system not included.
• Verify all clearances and assembly specifications before installation.

Comprehensive kit to upgrade a stock Shovelhead; includes cylinders, pistons, flywheel assembly, rods, pushrods, gaskets and a heavy-duty top motor mount.

Complete bolt-in engine performance kit from S&S. Includes cylinders, piston kits with pins and clips, Easy Start® cams, Quickee pushrods, TC3 cam support plate and oil pump, and precision hydraulic tappets. Made in USA. Not for '06 Dyna; '99–'04 Twin Cams need separate valve spring kit.