S&S CYCLE 128" Power Package - Chain Drive - Wrinkle Black with Non-Highlighted Fins - 114"/117" M8 310-1105B Motorcycle Tires - Off Road Increases horsepower and torque across

Increases horsepower and torque across the rpm range using air column inertia and carefully timed gas dynamic pressure waves

S&S recommends using S&S Cycle head bolts for all big bore appplications

/ Close 45

but once the engine starts and rpm increases

S&S CYCLE 128" Power Package - Chain Drive - Wrinkle Black with Non-Highlighted Fins - 114"/117" M8 310-1105B Motorcycle Tires - Off Road Increases horsepower and torque across128" Power Package Chain Drive Wrinkle Black with Non Highlighted Fins 114" 117" M8 Made in the USA, Big Bore Kit, Big bore bolt on kit increases 114" 117" with 4 1 2" stroke M Eight to 128" with no case machining required, 4 1 4" bore cylinders with 11: 1 forged pistons, Oil Pump Cam Plate, S&S oil pump cam plate with blue anodized finish, Passage plugs are removable for servicing, Independent scavenge sections for flywheel cavity and camchest,