Big-Bore Bolt-On Kit Increases 114 "/117" With 4-1/2 "Stroke M-Eight with No Case Machining Required, 4-1/4" Bore cylinders with 11: 1 Forged Pistons, S & S Oil Pump/CAM PLATE PLATE WITH BLUE ANODIST Scavenge Sections for Flywheel Cavity and Cam Chest, Debris Screen in Both Scavenge Pickups, Magnet in Cam Chest to Help Prevent Debris From Entering The Oil Pump, Increased Oil Flow Capacity on Both The Oil Feed and Scavent installed in the engine, quickee pushrods with chrome pushrod tubes, S&S Premium Tappets, S & S Hardanodized, Black Coated Tapps Are Billet Aluminum Construction, Improve Tappet Stability in High Lift, High-RPM SVORPM SITUATIONS, Springs work with cams up to .605 "Lift, High-Performance Conical Single-Wire Spring Design, All Se incluyen juntas, rodamientos y hardware necesarios para la instalación de Bolt-On, realizadas en los EE. UU.