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

Unleash incredible power and torque with the S&S Cycle 129" M8 performance kit, designed to transform your 107" Milwaukee-Eight engine into a formidable 129" powerhouse. This comprehensive bolt-on big bore kit simplifies your engine upgrade, requiring no case machining for a straightforward installation.

Description

Experience a dramatic increase in displacement and performance with the S&S Cycle 129" Power Package Engine Kit. Engineered specifically for 107" Milwaukee-Eight models, this kit features precision-machined 4.320" big bore cylinders paired with robust 11.0:1 forged pistons, delivering a significant boost in compression and overall power. The heart of this upgrade is the high-performance HPT496 cam, meticulously designed to complement big bore applications and maximize torque and horsepower output. Included Quickee pushrods with black tubes and S&S premium tappets ensure precise valve train operation, while the billet aluminum, hard-anodized black tappet cuffs provide enhanced durability. The kit also integrates S&S valve springs, capable of handling cams up to 0.605" lift, and a high-performance conical single-wire spring design for reliable valve control. With its multi-layered steel (MLS) head gasket, you can count on a secure and long-lasting seal. This American-made kit is designed for seamless integration, retaining your stock engine height and original serial numbers, and is compatible with both stock crankcases and S&S roller rocker arms, as well as first and second-generation stock valve springs. The advanced S&S oil pump and cam plate feature independent scavenge sections for the flywheel cavity and cam chest, along with debris screens and a cam chest magnet, ensuring superior oil flow, debris protection, and engine longevity. An adjustable pressure relief valve allows for fine-tuning even after installation, highlighting the thoughtful engineering behind this comprehensive upgrade.

Features & Highlights

• Effortless 129" Big Bore Upgrade: Transform your 107" Milwaukee-Eight engine to a powerful 129" displacement with a bolt-on kit that requires no case machining, simplifying installation.
• High-Performance Power Foundation: Equipped with durable 4.320" big bore cylinders and 11.0:1 forged pistons for a significant increase in compression and robust power delivery.
• Optimized Oil System for Longevity: Features an S&S oil pump/cam plate with independent scavenge sections, debris screens, and a cam chest magnet to ensure superior lubrication, protect against contaminants, and extend engine life.
• Precision Valve Train Components: Includes an HPT496 cam, Quickee pushrods with black tubes, S&S premium tappets, and high-performance valve springs designed for cams up to 0.605" lift, ensuring optimal engine response.
• Seamless Integration & Compatibility: Designed to work flawlessly with stock crankcases, stock and S&S roller rocker arms, and both generations of stock valve springs, while retaining stock engine height and original serial numbers.
• Premium American-Made Quality: Crafted in the USA with billet aluminum tappet cuffs, an MLS head gasket, and an adjustable pressure relief valve for exceptional durability, reliability, and serviceability.

Technical Specifications

• Product Name: Power Package
• Type: Engine Performance Kit
• Model: HPT496 Series
• Displacement: 129 cu. in.
• Bore Size: 4.320"
• Compression Ratio: 11.0:1
• Cam Drive Type: Gear
• Cooling System: Oil Cooled
• Color/Finish: Black, Non-Highlighted Fins
• Features: Black Pushrod Tubes
• Units: Kit
• Vendor Part Number: 310-1397

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