CYL KIT, 3-9/16" BORE, 4.650", FD, 920-0070, WBLACK, 86-UP X

Forged pistons - coated piston skirts with measurement window and S&S logo Forged pistons have larger than stock valve pockets and accepts up to 2.00" valves Kit includes S&S 1250 cc pistons with rings and wristpins, S&S 3-9/16" bore cylinders, MLS (Multi-Layer Steel) head, base and exhaust gaskets, assembly lube and instructions Made in the USA 883 models will require the use of XL1200 cylinder heads to achieve correct compression ratios. Will not work with XR1200 models. For the best performance CNC head porting, performance cams, exhaust and intake upgrades are recommended. Converts '86-'21 883 cc and 1200 cc Sportster models to 1250 cc displacement No machining or rebalancing is required