Engine upgrade

The biggest Big Bore possible with a slip in kit! These S&S cylinder and piston kits takes your 107" M8 to 129" and the 114" to 132". Huge displacement increase means huge power increase Works with stock crankcases Original engine serial numbers are retained Powder coat finish matches factory finish, giving the bike a "sleeper" advantage MLS (multi-layered steel) head...

The biggest Big Bore possible with a slip in kit! These S&S cylinder and piston kits takes your 107" M8 to 129" and the 114" to 132". Huge displacement increase means huge power increase Works with stock crankcases Original engine serial numbers are retained Powder coat finish matches factory finish, giving the bike a "sleeper" advantage MLS (multi-layered steel) head...

The biggest Big Bore possible with a slip in kit! These S&S cylinder and piston kits takes your 107" M8 to 129" and the 114" to 132". Huge displacement increase means huge power increase Works with stock crankcases Original engine serial numbers are retained Powder coat finish matches factory finish, giving the bike a "sleeper" advantage MLS (multi-layered steel) head...

The biggest Big Bore possible with a slip in kit! These S&S cylinder and piston kits takes your 107" M8 to 129" and the 114" to 132". Huge displacement increase means huge power increase Works with stock crankcases Original engine serial numbers are retained Powder coat finish matches factory finish, giving the bike a "sleeper" advantage MLS (multi-layered steel) head...