S&S Cycle 129" VVT Power Package Big Bore Kit for M8

Unleash significant power gains for your Harley-Davidson M8 engine with the S&S Cycle 129" VVT Power Package Big Bore Kit. This comprehensive bolt-on solution transforms your 107" M8 into a formidable 129" powerhouse, all without requiring costly and time-consuming case machining.

Description

Engineered for motorcycle enthusiasts seeking a substantial performance boost, the S&S Cycle 129" Power Package is a complete big bore upgrade designed specifically for Harley-Davidson M8 models equipped with VVT. This kit not only increases your engine's displacement from 107" to a potent 129" but also enhances overall reliability and longevity. At its core are robust 4.32" bore cylinders paired with high-strength 11.0:1 compression ratio forged pistons, delivering superior power and torque across the RPM range. The package includes an advanced S&S oil pump and cam plate, featuring a striking blue anodized finish, which significantly improves oil flow capacity on both the feed and scavenge sides. Independent scavenge sections for the flywheel cavity and cam chest, along with debris screens and a magnet, ensure optimal lubrication and protection against harmful contaminants. Installation is streamlined with Quickee pushrods and premium S&S tappets, complemented by hard-anodized, black coated billet aluminum tappet cuffs. The included S&S 550 cams are perfectly matched for big bore applications, working in conjunction with high-performance conical single wire valve springs that accommodate cam lifts up to 0.605". Proudly Made in the USA, this S&S Cycle VVT power package is the ultimate upgrade for your M8, providing a durable and exhilarating riding experience.

Features & Highlights

• Effortless Power Upgrade: Transform your 107" M8 engine into a powerful 129" without any case machining, making installation straightforward and cost-effective.
• Optimized Performance Components: Experience a dramatic increase in displacement and power with 4.32" bore cylinders and high-performance 11.0:1 compression ratio forged pistons, engineered for optimal combustion and durability.
• Advanced Oil Management: Features an S&S oil pump/cam plate with a blue anodized finish, boasting increased oil flow capacity, independent scavenge sections for flywheel and cam chest, debris screens, and a cam chest magnet for enhanced engine protection and lubrication. The adjustable pressure relief valve can be serviced while installed.
• Precision Valvetrain: Equipped with S&S 550 cams, Quickee pushrods, S&S premium tappets, and hard-anodized, black coated billet aluminum tappet cuffs for reliable and high-performance valve actuation.
• Durable Valve Springs: High-performance conical single wire valve springs are designed to work seamlessly with cams up to 0.605" lift, ensuring longevity and consistent performance under demanding conditions.
• USA-Made Quality: Manufactured in the USA, guaranteeing exceptional craftsmanship and reliability for discerning riders.

Technical Specifications

• Engine Displacement Increase: 107" M8 to 129"
• Cylinder Bore: 4.32"
• Piston Type: Forged
• Compression Ratio: 11.0:1
• Cam Lift Compatibility: Up to 0.605"
• Cam Type: S&S 550 Cams
• Tappet Cuff Material: Billet Aluminum (Hard-anodized, black coated)
• Oil Pump/Cam Plate Finish: Blue Anodized
• Manufacturing Origin: Made in the USA
• EAN: 09040204

Important to Know

• Will fit VVT models.
• Not for any Trike models.
• Intake/rocker cover gaskets are not included.