Zippers Muscle 128 Kit for the 114-117 M-8 is the most powerful top end and cam kit weve ever produced for a production motorcycle! The big breathing 4-valve heads on the M-8 engine just love displacement, so weve developed this kit for use with our new 4.250 bore drop-on cylinder. These cylinders are fitted with flat-top forged pistons and topped off with Zippers Stage III CNC headwork performed on your cores. Our Red Shift 552 cam delivers HUGE torque as soon as you open the throttle, and carries it across the RPM range to provide instant acceleration from any RPM.
Components included in the Muscle 128 kit: Zippers 4.250 Cylinder & Piston Kit Zippers Stage III CNC Headwork (on your cores) Red Shift 552 Cam & Bearing Quikee Pushrods, Covers & Tappet Cuffs Top End & Cam Gaskets, New Headbolts. Compression is set to a relatively modest 10.9:1 with 225# cranking compression same as stock, so starting is not an issue. It has an amazing sound at idle and under load, with 67 more horsepower than a stock 114 or 117, peaking at 5,800 RPM. Peak torque starts at 2,800 rpm 50 pounds more than stock, staying at nearly 150 ft/lbs for over 2,000 RPM, right where you ride! This super-flat torque curve delivers sport-bike-punishing instant throttle response at any RPM, allowing the bike to be ridden like a stocker when desired But what fun is that?
An EFI tuner, performance exhaust, oversize throttle body, injectors-intake will be required to achieve results shown. Requires your heads to be provided for modification. The item "Zippers M8 Muscle Big Bore Cylinders Cam Kit 114/117 128 Harley Touring Softail" is in sale since Tuesday, December 15, 2020.This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "americanclassicmotors" and is located in Zieglerville, Pennsylvania. This item can be shipped worldwide.