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

Elevate your Harley-Davidson Milwaukee-Eight 107" engine to a formidable 129" with the S&S Cycle Power Package Engine Performance Kit. This comprehensive big bore bolt-on upgrade delivers a significant boost in displacement and power, transforming your ride without requiring complex case machining.

Description

The S&S Cycle 129 engine performance kit is engineered to provide a substantial power increase for your 107" Milwaukee-Eight engine. This premium Harley-Davidson M8 big bore kit features massive 4.320" cylinders paired with durable 11.0:1 forged pistons, ensuring robust performance and longevity. A key advantage of this S&S Cycle 129 engine performance kit is its bolt-on design, eliminating the need for any case machining and making installation more straightforward. The kit includes an advanced S&S oil pump and cam plate with independent scavenge sections for both the flywheel cavity and cam chest, optimizing oil flow and scavenging efficiency. Debris screens in the scavenge pickups and a magnet in the cam chest further protect your engine by preventing contaminants from entering the oil pump. The adjustable pressure relief valve can even be fine-tuned while installed. Complementing the big bore setup are S&S Quickee pushrods with tubes, premium tappets, and billet aluminum hard-anodized black coated tappet cuffs. High-performance conical single wire valve springs, designed to work with cams up to 0.605" lift, are also included. At the heart of this high performance engine upgrade is the S&S Cycle HPT496 cam, specifically designed for big bore applications to maximize horsepower and torque. All components are meticulously crafted in the USA, ensuring exceptional quality and reliability. This bolt-on power package is designed to retain stock engine height, works seamlessly with stock crankcases, and is compatible with both stock and S&S roller rocker arms, preserving your original engine serial numbers.

Features & Highlights

• Experience a significant power boost with the S&S Cycle 129 engine performance kit, transforming your 107" Milwaukee-Eight into a high-performance 129" powerhouse. This true bolt-on big bore solution requires no case machining, simplifying installation and getting you back on the road faster.
• Equipped with robust 4.320" big bore cylinders and durable 11.0:1 forged pistons, this kit ensures exceptional strength and longevity, built to withstand the demands of increased displacement and power.
• The included S&S oil pump and cam plate feature independent scavenge sections for superior oil management, along with debris screens and a cam chest magnet to protect critical engine components from contamination, ensuring optimal lubrication and extended engine life.
• Optimize your valvetrain with S&S Quickee pushrods, premium tappets, billet aluminum tappet cuffs, and high-performance conical valve springs, designed to support cams up to 0.605" lift for maximum power potential.
• Harness the full potential of your big bore setup with the specially engineered HPT496 cam, meticulously designed to deliver optimal horsepower and torque gains for this displacement, providing a thrilling ride experience.
• Proudly Made in the USA, this S&S Cycle power package maintains stock engine height and is compatible with stock crankcases and rocker arms, ensuring seamless integration and preserving your original engine serial numbers.

Technical Specifications

• Type: Engine Performance Kit
• Model: HPT496 Series
• Bore Size: 4.320"
• Displacement: 129"
• Compression Ratio: 11.0:1
• Cam Drive Type: Chain
• Cooling System: Oil Cooled
• Color/Finish: Black, Highlighted Fins
• Vendor Part Number: 310-1396
• Made in USA: Yes