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S&S Cycle 129 Inch Power Pack for Harley M8 with 550 Gear Drive, Oil Cooled - Wrinkle Black (Part Number 310-1228C)
Regular price $3,497.95 USD
129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/o Highlight Fins - 107" M8 Enhance your Harley-Davidson...
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129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/o Highlight Fins - 107" M8
Enhance your Harley-Davidson M8 engine with the S&S Cycle 129 Inch Power Pack, featuring a 550 gear drive and oil-cooled design. This comprehensive bolt-on kit is engineered to increase the engine's displacement from 107 inches to 129 inches without requiring case machining, providing a straightforward upgrade for serious performance gains. The kit includes 4.32-inch bore cylinders with an 11.0:1 compression ratio forged pistons, delivering increased power and durability. The S&S oil pump and cam plate, finished in a sleek blue anodized coating, ensure efficient lubrication and reliable operation. Passage plugs are removable for easy servicing, and the independent scavenge sections for the flywheel cavity and cam chest improve oil flow and reduce potential clogging. Debris screens in both scavenge pickups and a magnet in the cam chest help prevent debris from entering critical oil passages, extending component life. The upgrade features increased oil flow capacity on both feed and scavenge sides for optimal lubrication under high-performance conditions. The adjustable pressure relief valve allows fine-tuning of oil pressure with the unit installed, ensuring optimal engine performance. The kit includes Quickee pushrods, S&S premium tappets, and hard-anodized, black-coated tappet cuffs made from billet aluminum, reducing wear and enhancing longevity. Designed for big bore applications, the S&S 550 cams work seamlessly with valve springs up to 0.605 inches lift, utilizing a high-performance conical single wire spring design. All necessary gaskets, bearings, and hardware are included for a bolt-on installation, simplifying the upgrade process. Made in the USA, this power pack combines durability, performance, and ease of installation, making it an ideal choice for enthusiasts seeking increased horsepower and engine reliability in their Harley M8.
Features:
- Big-bore bolt-on kit increases engine displacement from 107" to 129" without case modification.
- 4.32-inch bore cylinders with 11.0:1 compression ratio forged pistons for enhanced power and durability.
- S&S oil pump and cam plate with blue anodized finish for efficient lubrication and reliable operation.
- Removable passage plugs allow for easy servicing and maintenance.
- Independent scavenge sections for flywheel cavity and cam chest improve oil flow and reduce debris buildup.
- Debris screens in both scavenge pickups and a magnet in the cam chest prevent debris from entering critical oil passages.
- Increased oil flow capacity on feed and scavenge sides ensures optimal lubrication during high-performance operation.
- Adjustable pressure relief valve permits fine-tuning of oil pressure with the unit installed in the engine.
- Quickee pushrods, S&S premium tappets, and hard-anodized, black-coated billet aluminum tappet cuffs enhance durability.
- S&S 550 cams designed for big bore applications, compatible with valve springs up to 0.605 inches lift.
- High-performance conical single wire spring design for reliable valve operation.
- Complete with gaskets, bearings, and hardware for straightforward bolt-on installation.
- Made in the USA with precision craftsmanship for durability and performance.
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