Tru Power Engine Kit. 4-Cylinder Diesel, 254 CID. 4-1/8 inch standard bore, 4-1/4 inch overbore supplied. 3-ring piston, Keystone top compression ring, bearing locating tabs placed off-center both halves. Basic engine kit. Contains sleeves & sleeve seals, pistons & rings, pins & retainers, pin bushings, standard rod and main bearings, connecting rod bolts, complete gasket set, crankshaft seals. For 3010 Series, 3020 Series. Contains : 4-SAT4409 JD cyl slv set, 4-TP-R30939 pin bushing, 1-FS3217W JD gasket set, 8-TP-R66452 conn rd bolt.