S&S Cycle M8 Power Package Engine Performance Kit - 310-1109B

Upgrade your Milwaukee-Eight engine with the S&S Cycle 128" Power Package. This big bore kit delivers a significant performance boost, transforming your 114" or 117" engine into a powerful 128" powerhouse. Experience increased torque and horsepower without the need for case machining.

Description

The S&S Cycle 128" Power Package is engineered for bolt-on performance. Featuring 4.250" bore cylinders and high-compression 11.1:1 forged pistons, this kit maximizes combustion efficiency for substantial power gains. The included S&S oil pump and cam plate assembly ensures superior oil delivery and scavenging, enhancing engine reliability and longevity. The adjustable pressure relief valve allows for fine-tuning while installed. S&S premium tappets and hard-anodized tappet cuffs provide improved tappet stability, particularly in high-lift, high-RPM conditions. Paired with S&S 550 cams and valve springs capable of handling up to 0.605" lift, this kit provides a comprehensive upgrade for serious performance enthusiasts. The black granite finish with highlighted fins offers a distinctive look under the hood, combining style and performance.

Features & highlights

• Transforms your 114"/117" M8 engine to a potent 128" without case machining.
• Features 4.250" bore cylinders with 11.1:1 compression ratio forged pistons for maximum power.
• Includes S&S oil pump and cam plate for enhanced oil delivery and scavenging.
• S&S premium tappets and tappet cuffs improve stability at high RPMs.
• Equipped with S&S 550 cams and valve springs, supporting up to 0.605" lift.
• Adjustable pressure relief valve allows fine-tuning while installed.
• Complete kit includes all necessary gaskets, bearings, and hardware for a seamless installation.

Technical specifications

• Brand: S&S Cycle
• Displacement: 128"
• Bore Size: 4.250"
• Stroke Length: 4.500"
• Compression Ratio: 11.1:1
• Cam Drive Type: Chain
• Cooling System: Oil Cooled
• Type: Engine Kit
• Finish: Black Granite with Highlighted Fins

Important to know

This kit is designed as a bolt-on upgrade for 114" and 117" Milwaukee-Eight engines. Professional installation is recommended to ensure optimal performance and reliability.