S&S Cycle 310-1102D Power Pack Engine Performance Kit - 128 M8

The S&S Cycle 310-1102D is a complete 128-cubic-inch big bore power package engineered for Milwaukee-Eight (M8) engines. This all-in-one performance kit transforms your stock displacement engine into a high-output powerplant, delivering substantial gains in torque and horsepower without requiring crankcase machining.

Key Features:

• Big Bore Upgrade: Increases displacement to 128" using precision-matched cylinders and forged pistons
• Bolt-On Design: No crankcase machining required — retains stock engine height and original engine serial numbers
• Matched Components: Includes S&S cam/cam plate and high-performance oil pump for consistent oil pressure and engine longevity
• High-Performance Cam: Performance-matched S&S cam included for optimal power delivery across the RPM range
• Forged Pistons: High-compression forged pistons for improved thermal efficiency and durability
• MLS Head Gaskets: Multi-layered steel head gaskets for superior sealing under high-performance conditions
• Blue Anodized Finish: Precision-machined billet aluminum oil pump and cam plate with blue anodized finish
• Debris Protection: Magnet in cam chest helps prevent debris from entering the oil pump; debris screen in scavenge pickups
• Serviceable Design: Passage plugs are removable for easy servicing
• Made in the USA: Manufactured in the United States by S&S Cycle

Important Notes: Professional installation by an experienced mechanic with access to a factory service manual is strongly recommended. Verify flywheel pinion shaft runout and end play before installation — excessive runout may cause damage and void warranty. An aftermarket fuel management tuner is highly recommended to maximize performance gains. Not legal for sale or use in California on any pollution-controlled motor vehicle.