Revolution Performance 139" Big Bore Kit for '17-Up Harley Davidson 107 M-8 Harley Davidson Models - Black w/ highlighted fins

Revolution Performance 139" Big Bore Kit for '17-Up Harley Davidson 107 M-8 Models - Black w/ highlighted fins

 for 107" engines with 4-1/2" bores and 4-3/8" strokes

• Aerospace-grade all-aluminum cylinder with nickel-silicon-carbide (NSC) electroplated bore
• NSC-plated cylinders have less friction for increased horsepower, lower engine temperatures and a longer lifespan
• Includes pair of all-aluminum NSC-coated bore cylinders, custom-forged pistons with high-tension rings specifically designed for NSC cylinders and a head/base gasket set
• Replacement gasket sets available separately
• Upgraded cylinders studs and head bolts recommended
• Made in the USA
• Monster big bore kit requires case boring.
• No sleeving allows for larger bore sizes.

• BORE SIZE 4.500"
• DISPLACEMENT 139"
• STROKE LENGTH 4-1/2"