Tru Power Engine Kit. 4-Cylinder Continental Gas, 129 CID. 3-1/4 inch Standard Bore, 3-3/8 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, .010 inch rod bearing and main bearings. For TO30 Series.