Briggs & Stratton M-Series Crate Engines

Building off the proven success of the Animal engine, Briggs & Stratton M-Series crate engines are the first dedicated racing engine engineered to meet the needs of the Quarter Midget market. Right out of the box, the M-Series is focused on the consistency and simplicity that racers expect. Briggs & Stratton race-only M-Series crate engine specs and features: * Performance and durability: Technology from OHV racing engineered to the specific needs of Quarter Midget racing * Assembled by hand and tested to strict quality standards * Reinforced, cast iron sleeved, dual ball bearing racing cylinder * Single cast, custom aluminum alloy cylinder head with high-flow intake port, custom seat/guide material * Squeeze cast, T-7 heat-treated aluminum rod with reinforced I-beam * Carbon steel crankshaft with induction-hardened, micro-polished, crankpin-reinforced timing gear—and hardened splined output shaft for 6-1 gearbox (555721) * Custom top control plate firewall clearance * Cam ground, barrel faced, eutectic alloy piston with 3-piece ring set with chrome faced top ring * High-silicon racing engineered valve springs for seasons of racing * High-grade stainless steel dished valves with nitrited exhaust * Three-piece automotive style keepers and reinforced rocker arm and lock ball * PVL digital ignition with built in 6,100 rpm rev limiter * PVL steel hub, cast aluminum flywheel * Briggs & Stratton tooled 22mm round slide, fully adjustable jet carburetor * Custom graph oil composition head gasket Show Less