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.
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Computer-designed alloy-steel cams with heat treatment; made in USA. Four-gear set required. Installer must verify coil bind and clearances.
Precision-cut gasket base for 74/80" SHVL engines; ensures reliable sealing and fitment.
Gasket base for 3.625" bore applications. Machined, durable construction for consistent sealing.
Seals CV carburetor to S&S intake manifolds. Allows proper sealing for reliable performance. Made in the USA.
- Bolt-on power: +40–50% on stock 107", 114" and 117" M‑Eight motors.
- Compressor and turbine housing with Garrett internals; plenum with integrated blow-off valve.
- Includes injectors, spark plugs, boost gauge with mount, oil feed/drain lines, custom cam cover, tune files, hardware and gaskets.
- Requires Thundermax ECM (sold separately). Does not fit Twin Cooled or non-removable fairing lowers. Offroad use only.
- Made in the USA.
Comprehensive gasket kit with MLS head gaskets, Viton-coated base gaskets and AFM exhaust seals; made in the USA.
Complete gasket kit with MLS head gaskets, Viton-coated base gaskets, blue Viton valve stem seals, and AFM exhaust gaskets. Made in the USA. Includes motor gaskets plus primary, derby and inspection cover gaskets where applicable.
Precision cam shims for accurate valve adjustment. Made in the U.S.A.
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.