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 bore increase means huge power increase
- Works with stock crankcases (no machine work)
- Powder coat finish matches factory finish,
- MLS (multi-layered steel) head gaskets
- 4.320" Bore
- Retains stock engine height
- Includes Cubic Inch Cam Cover Badge
- Made in USA
DISCLAIMER:
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution controlled motor vehicle.
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129” Packing in the power
I was optimistic upon order the 129 big bore kit after all the controversy about the skirt being to thin or the heat would distort the cylinder, I’m glad to say 14k miles later I’ve had zero issues with my build and coming from a 107 to a ripping 129 …made 146 hp and 154 torque…
