Tru Power Engine Kit. 4-Cylinder Gas, 180 CID. 3.86 inch Standard Bore, 3-Ring Piston, 2 Grooves on Sleeve. Basic Engine Kit. Contains sleeves & sleeve seals, pistons & rings, pins & retainers, pin bushings, standard rod and main bearings, complete gasket set, crankshaft seals. For 2510 Series, 2020 Series.