S&S Cycle 129" Power Package Engine Performance Kit for 107" M8

Unleash the full potential of your 107" Harley-Davidson Milwaukee-Eight engine with the S&S Cycle 129" Power Package Engine Performance Kit. This comprehensive bolt-on solution transforms your M8 into a formidable 129" powerhouse, delivering significant power and torque gains without the need for case machining.

Description

Experience a dramatic increase in performance with the S&S Cycle 129" Power Package, meticulously engineered to upgrade your 107" M8 engine. This kit features robust 4.320" big bore cylinders paired with durable 11.0:1 forged pistons, providing the foundation for serious power. At its core is the high-performance HPT496 cam, specifically designed to optimize big bore applications, ensuring aggressive power delivery and improved throttle response. The kit includes a premium S&S oil pump and cam plate system, boasting independent scavenge sections for the flywheel cavity and cam chest, along with debris screens and a magnet in the cam chest to maintain optimal lubrication and engine longevity. With increased oil flow capacity on both the feed and scavenge sides, and an adjustable pressure relief valve, your engine's oil system will perform flawlessly. Installation is streamlined with S&S Quickee pushrods and black pushrod tubes, premium tappets, and billet aluminum tappet cuffs. S&S valve springs, capable of handling cams up to 0.605" lift, ensure reliable valve train operation. This Made in the USA kit retains your original engine serial numbers and stock engine height, ensuring a seamless upgrade. It's compatible with stock crankcases, stock or S&S roller rocker arms, and both first and second-generation stock valve springs.

Features & Highlights

• Effortless Big Bore Upgrade: Transform your 107" M8 engine to a powerful 129" displacement with this bolt-on kit, eliminating the need for costly and complex case machining.
• High-Performance Cylinder & Piston Set: Gain superior power and durability with 4.320" big bore cylinders and high-strength 11.0:1 forged pistons, engineered for optimal combustion and longevity.
• Advanced Oil Management System: Optimize engine lubrication with the S&S oil pump and cam plate, featuring independent scavenge sections, debris screens, and a cam chest magnet for enhanced oil flow and protection.
• Robust Valve Train Components: Benefit from S&S Quickee pushrods, premium tappets, and billet aluminum tappet cuffs, complemented by S&S valve springs designed to support cams up to 0.605" lift.
• Optimized Performance Camshaft: Maximize your big bore application's potential with the specially designed HPT496 cam, delivering aggressive power characteristics and improved throttle response.
• Complete & Compatible Package: Includes a durable MLS head gasket and an exclusive 129 cam cover badge, ensuring a comprehensive upgrade that retains stock engine height, serial numbers, and broad compatibility with stock components.

Technical Specifications

• Type: Engine Performance Kit
• Model: HPT496 Series
• Units: Kit
• Bore Size: 4.320"
• Displacement: 129"
• Compression Ratio: 11.0:1
• Cam Drive Type: Gear
• Cooling System: Oil Cooled
• Color/Finish: Black, Highlighted Fins
• Features: Black Pushrod Tubes
• Vendor Part Number: 310-1398