S&S Cycle 132" Big Bore Engine Performance Kit for M8

Unleash incredible power from your Harley-Davidson Milwaukee-Eight engine with the S&S Cycle 132" Big Bore Kit. This comprehensive bolt-on performance package is engineered to transform your 114" or 117" M8 into a formidable 132" powerhouse, delivering a significant boost in displacement and performance without requiring any case machining.

Description

The S&S Cycle 132" Big Bore Kit is a direct bolt-on solution designed to elevate your M8 engine's capabilities, boosting displacement to a massive 132". This kit features robust 4.320" big bore cylinders paired with high-strength 11.0:1 forged pistons, ensuring exceptional compression and durability for demanding riding. At its core is the high-performance HPT496 cam, specifically engineered for big bore applications to deliver optimal power and torque across the RPM range. The integrated S&S oil pump and cam plate system provides superior lubrication and cooling, incorporating independent scavenge sections for the flywheel cavity and cam chest, debris screens in both pickups, and a magnet in the cam chest to prevent contaminants from reaching the pump. An adjustable pressure relief valve allows for fine-tuning even after installation, optimizing oil flow. This kit also includes S&S Quickee pushrods with chrome pushrod tubes, premium tappets, and hard-anodized, billet aluminum tappet cuffs for a robust valvetrain. High-performance conical single wire S&S valve springs are included, compatible with cams up to 0.605" lift, ensuring reliable valve control. A multi-layered steel (MLS) head gasket provides a dependable seal. Designed for seamless integration, this performance kit retains stock engine height, works perfectly with stock crankcases and both stock and S&S roller rocker arms, and preserves your original engine serial numbers. Proudly Made in the USA, it’s a complete upgrade for serious M8 enthusiasts.

Features & Highlights

• Massive Displacement Increase: Transform your 114"/117" M8 engine into a potent 132" without costly case machining, offering a direct bolt-on power upgrade.
• Optimized Power & Durability: Features 4.320" big bore cylinders paired with 11.0:1 forged pistons and an HPT496 cam, engineered for peak performance and long-term reliability.
• Advanced Oil Management System: Integrated S&S oil pump and cam plate with independent scavenge sections, debris screens, and a cam chest magnet ensure superior lubrication and engine longevity.
• Premium Valvetrain Components: Equipped with S&S Quickee pushrods, premium tappets, billet aluminum tappet cuffs, and high-performance valve springs compatible with up to 0.605" lift cams.
• Seamless Integration: Designed to retain stock engine height, work with original crankcases and rocker arms, and preserve your engine's serial numbers for hassle-free installation and compliance.
• Complete Performance Package: Includes an MLS head gasket and a distinctive 132 cam cover badge, all proudly Made in the USA.

Technical Specifications

• Type: Engine Performance Kit
• Model: Power Package
• Style: HPT496 Series
• Displacement: 132"
• Bore Size: 4.320"
• Compression Ratio: 11.0:1
• Cam Model: HPT496
• Cam Drive Type: Chain
• Cooling System: Oil Cooled
• Color/Finish: Black Granite
• Pushrod Tubes: Chrome
• Valve Spring Compatibility: Cams up to 0.605" lift
• Manufacturing: Made in the USA
• Vendor Part Number: 310-1388