• For balanced Twin Cam models
• Converts a stock engine to 124" using the stock crankcases
• Includes S&S Super Stock® 91 cc cylinder heads, 4.125" big bore cylinders, forged big bore flattop pistons, S&S 4.625" stroke flywheel assembly, S&S 640 gear drive Easy Start cams, S&S premium tappets, S&S adjustable pushrods, roller rocker arms, and all hardware, gaskets and instructions
• Made in the USA

Notes

• EFI system must be recalibrated.
• Fuel or ignition system not included.
• All clearances and assembly specifications will need to be checked.
• Although the engine is 0.960" taller than stock, there are no frame clearance problems, and a stock EFI throttle body will fit because the manifold mounting surfaces of the heads have been specially machined to fit a stock length manifold.