Tru Power Engine Kit. 6-Cylinder Diesel, 404 CID. 4-1/4 inch Standard Bore. 3-Ring Piston, Keystone Top Compression Ring. Engine Overhaul Kit. Contains sleeves & sleeve seals, pistons & rings, pins & retainers, pin bushings, connecting rod bolts, complete gasket set, crankshaft seals, intake & exhaust valves, springs, guides, retainers. Standard rod & main bearings. For 4230 Series, 4040 Series.