124ci Hot Set Up Kit with 91cc S&S Cylinder Heads – Black. Fits Twin Cam Softail 2007-2017.

Product Details Features & Benefits:-* Fits Softail 2007-2017 with Twin Cam B Engine. * This 124ci big bore/stroker Hot Set Up Kit transforms a stock engine into a 124ci monster.* Includes S&S 4-1/8in. bore pistons.* Includes big bore cylinders finished in wrinkle black powder coat.* Includes a dynamically balanced 4-5/8in. stroke three piece flywheel assembly complete with S&S heavy duty connecting rods & intergal mainshafts.* Includes S&S 640 gear drive Easy Start ca mshafts.* Includes S&S chromoly steel adjustable pushrods.* Includes S&S premium tappets* Includes S&S Super Stock 91cc cylinder heads. * When installed the kit yields a 124ci engine with a compression ratio of 10.8:1 * Although the engine is .960in. taller than stock, there are no frame clearance problems.* 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.< /P>* No fuel or ignition system is included. * However, for the best results, a larger EFI throttle body, performance intake and performance exhaust are recommended. * The EFI system must be recalibrated.Tech Tips:-* Fits Softail Only.* Requires the following items to complete the installation:-1. Throttle Body, Manifold, Flanges & Seal Kit # HPI-58D6-182. Maximus Tuner # TR4-002-002 or similar.3. Crankcase Machining, Timken Bearing # SS31-4013, Replacement Timken Sleeve # JM-956 & Complete Timken Bearing Conversion Tool # JM-959 if required.4. Stock crankcases require machining to accept 4-1/8in. cylinders.Proudly Made in the USA by S&S Cycle ! MFR PART No: 900-0569 ROLLIES PART No: SS900-0569