Tru Power Engine Kit. 6-Cylinder Diesel, 3-11/16 inch Standard Bore, Cupped-Head Piston, 3.873 inch Sleeve Flange Diameter, 1-3/8 inch Exhaust Valve Head Diameter, 4 inch Thrust Bearing Flange. Engine Overhaul Kit. Contains sleeves, sleeve seals, pistons & rings, pins & retainers, pin bushings, complete gasket set, crankshaft seals, intake & exhaust valves, springs, guides, valve keys, .010 inch rod bearings and main bearings. For 656 Series, 706 series, 2656 Series, 2706 Series.