S&S CYCLE 129" Power Package Engine Performance Kit — 129", bore 4.320", stroke 4.375", black – 18-23 Softail, 17-23 Touring, 22-23 CVO

The 129" Power Package Engine Performance Kit transforms a 107" oil-cooled M8 into a 129" without case machining required. Built for durability and serviceability, the kit includes big-bore cylinders with matching cam, cam plate and oil pump, independent scavenge sections for the flywheel cavity and cam chest, and a magnet in the cam chest to help keep debris out of the oil pump. 🔧

• Big bore cylinders with matched components for a complete conversion
• Independent scavenge sections and debris screens in both pickups
• High-performance conical single-wire S&S valve springs and a performance-matched 550 cam
• MLS multi-layered steel head gaskets and removable passage plugs for easy servicing
• Retains original engine serial numbers and works with the stock crankcase

Designed and manufactured in the USA for riders seeking reliable, race-ready power with straightforward installation. ⚙️