Tru Power Engine Kit. 4-Cylinder Continental Gas, 120 CID. 3-3/16 inch Standard Bore, 3-5/16 inch Overbore Supplied. Engine Overhaul Kit. Contains sleeves & sleeve seals, pistons & rings, pins & retainers, pin bushings, complete gasket set, crankshaft seals, intake valves & seals, exhaust valves, valve retainers, springs & guides.standard rod bearings and main bearings. For TE20 Series, TO20 Series.