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.
