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S&S Cycle 129-inch Big Bore Power Package for Harley M8 with HPT496 Cam - Chain Drive, Oil Cooled, Black Finish
Regular price $3,294.95 USD
129" Power Package - HPT496 - Chain Drive - Oil Cooled - Black with Highlights - 107" M8 Upgrade your Harley-Davidson M8...
Lease for as low as $/week
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129" Power Package - HPT496 - Chain Drive - Oil Cooled - Black with Highlights - 107" M8
Upgrade your Harley-Davidson M8 engine with the S&S Cycle 129-inch Big Bore Power Package, part number 310-1396. This comprehensive kit increases the engine's displacement from 107 inches to 129 inches without requiring case machining, offering a straightforward installation for enhanced performance. Featuring a 4.320-inch big bore cylinder and 11.0:1 forged pistons, this package provides significant power gains while maintaining the stock engine height and compatibility with stock crankcases and roller rocker arms. The kit is designed to work seamlessly with both first and second generation stock valve springs, including oval and round port configurations, ensuring versatility across various Harley models.
Built with premium components, the package includes an HPT496 cam optimized for big bore applications, delivering improved torque and horsepower. The MLS multi-layered steel head gasket ensures a reliable seal under increased pressure. The kit also features adjustable pressure relief valves, removable passage plugs for servicing, and debris screens in both scavenge pickups, all contributing to enhanced durability and maintenance ease. The oil system is upgraded with increased flow capacity on both feed and scavenge sides, complemented by an integrated magnet in the cam chest to help prevent debris from entering the oil pump. Quickee pushrods with pushrod tubes, premium S&S tappets, and hard anodized black-coated tappet cuffs made of billet aluminum further enhance the engine's performance and longevity.
The 129-inch Power Package includes a distinctive cam cover badge, showcasing the upgrade’s high-performance nature. Made in the USA, this kit preserves the original engine serial numbers and is compatible with stock engine components, including the stock crankcase and roller rocker arms. Its chain drive configuration ensures reliable power transfer, and its oil-cooled design helps manage heat during high-performance riding. Whether you're looking for increased power, improved reliability, or a custom look, the S&S Cycle 129" Power Package delivers professional-grade quality and performance for your Harley M8 engine.
Features:
- Big bore increase from 107" to 129" with no case machining required
- Includes 4.320" cylinder and 11.0:1 forged pistons for enhanced power
- HPT496 cam designed specifically for big bore applications
- Oil system upgraded with increased flow capacity and debris prevention features
- Removable passage plugs for easy servicing and maintenance
- Premium S&S tappets with black-coated billet aluminum cuffs
- Adjustable pressure relief valve for fine-tuning oil pressure
- MLS multi-layered steel head gasket for sealing performance
- Compatible with stock and S&S roller rocker arms, stock valve springs, and engine components
- Made in the USA, retains original engine serial numbers and height
