Tru Power Engine Kit. 4-Cylinder Gas, 264 CID. 4 inch Standard Bore, 4-1/8 inch Overbore Supplied. Stepped-Head Piston with 1 inch Head Diameter. Engine Overhaul Kit, less bearings. Contains sleeves & sleeve seals, pistons & rings, pins & retainers, pin bushings, complete gasket set, crankshaft seals, intake & exhaust valves, springs, guides, valve keys. For 400 Series, W400 Series, 450 Series, W450 Series.