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S&S Cycle 128-Inch Power Package for M8 with Chain Drive - Black Granite Finish with Highlighted Fins (Part #310-1109B)
Regular price $3,169.95 USD
128" Power Package - Chain Drive - Black Granite with Highlighted Fins - 114"/117" M8 Designed and manufactured in the USA, the...
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128" Power Package - Chain Drive - Black Granite with Highlighted Fins - 114"/117" M8
Designed and manufactured in the USA, the S&S Cycle 128-inch Power Package offers a significant upgrade for M8 engines, delivering increased performance and reliability. This bolt-on big bore kit raises the engine displacement from 114 or 117 inches to 128 inches without requiring case modifications, making it an ideal choice for those seeking a straightforward upgrade. The kit features 4-1/4 inch bore cylinders paired with 11:1 forged pistons, providing a robust foundation for high-performance applications. The included oil pump and cam plate, finished in a striking blue anodized coating, ensure efficient oil flow and easy maintenance, with removable passage plugs for servicing and independent scavenge sections for the flywheel cavity and camchest. A debris screen in both scavenge pickups and a magnet in the camchest help prevent debris entry into the oil pump, enhancing durability and engine longevity. Additionally, the oil flow capacity has been increased on both feed and scavenging sides, ensuring optimal lubrication under demanding conditions. The adjustable pressure relief valve allows fine-tuning of oil pressure with the unit installed, providing flexibility for different riding styles and engine setups. The kit includes high-quality components such as Quikee chrome pushrods with matching pushrod tubes, premium S&S tappets, and billet aluminum tappet cuffs with a hard-anodized black coating to improve tappet stability during high-lift and high-RPM scenarios. The S&S 550 camshaft, specifically designed for big bore applications, offers excellent power gains. Paired with high-performance conical single-wire valve springs suitable for lifts up to .605 inches, this package ensures reliable valve operation at elevated RPMs and power levels. This comprehensive upgrade kit combines performance, durability, and aesthetic appeal, making it an excellent choice for motorcycle enthusiasts looking to maximize their M8 engine's potential.
Features:
- Made in the USA for quality assurance
- Increases engine displacement from 114/117 inches to 128 inches with no case machining required
- 4-1/4 inch bore cylinders with 11:1 forged pistons for durability and performance
- Blue anodized S&S oil pump and cam plate with removable passage plugs for easy servicing
- Independent scavenge sections for flywheel cavity and camchest enhance oil flow and debris prevention
- Debris screens and a magnet in the camchest protect the oil pump from contaminants
- Enhanced oil flow capacity on both feed and scavenge sides for improved lubrication
- Adjustable pressure relief valve allows precise oil pressure tuning
- Quikee chrome pushrods with chrome pushrod tubes for reliable valve operation
- Premium S&S tappets with billet aluminum, black-coated tappet cuffs for high-lift stability
- S&S 550 camshaft designed for big bore applications to maximize power output
- High-performance conical single-wire valve springs support lifts up to .605 inches
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