Description
If you’re serious about extracting maximum horsepower from your M8, a big bore kit isn’t optional—it’s essential. The S&S Power Pack Twin Cooled delivers the displacement increase, oil management, and valve train precision that separates bolt-on performance from genuine, reliable power gains. This is engineered for riders pushing their Harley to the limit without sacrificing engine longevity.
Engine & Displacement:
- 4.250″ bore diameter
- Bolt-on installation
- No case machining
- Forged pistons included
- 11.1:1 compression ratio
Oil System (Twin Cooled Design):
- Billet aluminum pump/plate
- Increased feed capacity
- Increased scavenge capacity
- Independent scavenge sections
- Flywheel & cam chest separation
- Debris screens both pickups
- Cam chest magnet included
- Removable passage plugs
- Adjustable relief valve
Valve Train Components:
- S&S 550 cam (big bore spec)
- S&S premium tappets
- Quickee pushrods
- Billet aluminum tappet cuffs
- Superior distortion resistance
- High-RPM stability optimized
Fitment:
- M8 Harley-Davidson engines
- MPN: 310-1050B
