Description
If you’re running an M8 and want real power gains without tearing down your cases, the S&S CYCLE Power Pack Twin Cooled delivers measurable performance through a precision big bore kit that bolts straight on. This isn’t just displacement—it’s engineered breathing, cooling, and reliability at high RPM, giving you the headroom to push harder without compromise. Built with the same attention to detail S&S demands in professional racing, every component works together to maximize flow, manage heat, and keep debris out of your oil system.
- 4.250″ bore diameter
- Forged pistons, 11.1:1 compression
- Bolt-on installation, no case machining
- Billet aluminum oil pump/cam plate
- Independent scavenge sections (flywheel cavity, cam chest)
- Debris screens on both pickups
- Magnet in cam chest for protection
- Adjustable pressure relief valve
- Removable passage plugs for service
- S&S 550 cam for big bore applications
- Premium S&S tappets included
- Billet tappet cuffs, reinforced design
- Quickee pushrods
- Increased feed and scavenge flow capacity
- MPN: 310-1054B
