S&S 128" M8 Power Package Big Bore Kit for Milwaukee 8

Upgrade your Milwaukee-Eight engine with a complete performance solution. By purchasing all matched components in one comprehensive kit, you ensure peak compatibility while saving significantly over individual part purchases. This Power Package is designed to transform your 114" engine into a high-output 128" powerhouse without the need for case machining.

Big Bore Kit Specifications:

• 114" to 128" Big Bore Kit for Stock Stroke Flywheel
• No case machining required for installation
• 4.250" bore with Forged Pistons
• 11.1:1 Compression Ratio

Oil Pump and Cam Plate:

• Precision machined from Billet Aluminum with a Blue Anodized finish
• Independent scavenge sections for flywheel cavity and cam chest
• Debris screens in both scavenge pickups and magnet in cam chest for engine protection
• Increased flow capacity on both feed and scavenge sides
• Pressure relief valve is adjustable with the unit installed in the engine

Valvetrain and Cam Components:

• S&S 550 Cam - Specifically designed for Big Bore applications
• Quickee Pushrods with Chrome Pushrod Tubes for easy adjustment
• S&S Precision Tappets and Billet Aluminum Tappet Cuffs
• Hard anodized tappet cuffs eliminate distortion and improve stability in high RPM situations
• High-performance conical single wire valve springs (stable up to .605 lift)

Compatibility and Installation:

• Fits 2017-up Harley-Davidson Touring and Softail Milwaukee-Eight 114" models
• Available in configurations for both Oil Cooled and Water Cooled applications
• Includes all required gaskets, bearings, and hardware for a complete installation
• MADE IN USA

Note: Not recommended for Tri-Glide or other three-wheel models including conversions due to the lugging nature of these motorcycles.