S&S M8 Big Bore 129″ Highlighted Cylinders 4.375″ Pistons Top End Kit Harley 17+

BRAND NEW

PART #910-0843

Fits 2017+ Harley Softail and Touring Models

We love raw, unadulterated thumping, makes your heart skip a beat kind of power, and thats the very stuff we specialize in.
This obsession with power is further proven by our latest efforts for the Milwaukee Eight powered Harley-Davidson models.
These bolt-in 129 Cubic Inch (thats well over 2000cc for you metric folks) Big Bore Kits are just this side of monstrous.
Taking the stock engine from a mild-mannered 107 CI to a fire-breathing 129 CI or the 114 CI models to 132 cubic inches of tire melting power.
The latest is a 4.32 bore and is slated for an 11:1 compression ratio, so its happy with pump gas but will still compliment a high lift cam. No case mods and no engine removal; just a massive set of jugs designed, tested, and manufactured here in the USA.
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 match factory finish, giving the bike a sleeper advantage
MLS (multi-layered steel) head gaskets
Retains stock engine height
Includes Cam Cover Badge