S&S Cycle 129" Power Package HPT496 for 107" M8 Engines with Gear Drive and Oil Cooled System

129" Power Package - HPT496 - Gear Drive - Oil Cooled - Black with Highlights - 107" M8

Upgrade your Harley-Davidson 107" M8 engine with the S&S Cycle 129" Power Package HPT496, designed for high performance and durability. This comprehensive bolt-on kit increases engine displacement from 107 inches to 129 inches without requiring case machining, offering a seamless upgrade path for enthusiasts seeking more power. The package features a big bore 4.320-inch cylinder with forged pistons boasting an 11.0:1 compression ratio, ensuring enhanced combustion efficiency and increased horsepower. Included is an S&S oil pump and cam plate, with removable passage plugs for easy servicing, along with independent scavenge sections for the flywheel cavity and cam chest, which help improve oil flow and engine reliability. Both the oil feed and scavenge sides are optimized for increased capacity, supporting higher performance applications while maintaining proper lubrication.

The kit also includes an adjustable pressure relief valve that can be fine-tuned with the unit installed in the engine, ensuring optimal oil pressure under various operating conditions. Quickee pushrods and pushrod tubes, combined with S&S premium tappets, facilitate precise valve operation. The S&S hard anodized, black-coated billet aluminum tappet cuffs and high-performance valve springs compatible with cams up to 0.605 inches lift provide durability and reliable valve control. The HPT496 cam is specifically designed for big bore applications, delivering significant power gains while maintaining smooth engine operation. A multi-layered steel (MLS) head gasket ensures a proper seal, and the package includes a 129 cam cover badge for added aesthetics.

Made in the USA, this power package retains the original engine serial numbers and works with stock crankcases, stock and S&S roller rocker arms, and both first and second-generation stock valve springs. The design preserves the stock engine height and is compatible with existing engine components, making installation straightforward for qualified technicians. Whether you're enhancing your Harley-Davidson touring or custom bike, the S&S Cycle 129" Power Package provides a reliable, high-performance upgrade with a focus on quality and longevity.

Features:

• Increases engine displacement from 107" to 129" without case machining

• Big bore 4.320" cylinder with forged pistons and 11.0:1 compression ratio

• Includes S&S oil pump and cam plate with removable passage plugs for servicing

• Independent scavenge sections for flywheel cavity and cam chest improve oil flow

• Enhanced oil capacity on feed and scavenge sides supports high-performance use

• Adjustable pressure relief valve allows on-the-fly oil pressure tuning

• Quickee pushrods and tubes for precise valve operation

• S&S premium tappets with black anodized, billet aluminum cuffs for durability

• High-performance valve springs compatible with cams up to 0.605" lift

• HPT496 cam designed specifically for big bore applications to maximize power

• MLS head gasket ensures a reliable seal under increased pressure

• Includes 129 cam cover badge for aesthetic enhancement

• Made in the USA with high-quality materials and craftsmanship

• Retains stock engine height and works with stock crankcases and components

• Compatible with stock and S&S roller rocker arms and both first and second-generation valve springs