All parts are clean, guaranteed. Standard crankshafts, 0 re-boring, guaranteed. Four heads, number 823, guaranteed. Set of pistons and connecting rods for 6.0, guaranteed. 6-speed transmission torque converter, guaranteed. Crankshaft pulley, guaranteed. GM alternator, guaranteed. Two water pumps, one GM and the other Mexican, guaranteed. Four head covers. Front timing cover with seal and sensor, guaranteed. Power steering pump, guaranteed. One clean engine mount. Clean air reservoir with sensor. Clean GM oil pan. Two camshaft gears. GM compressor. Lifter bodies. Throttle body, clean, guaranteed. Clean stock headers. If you need any part not listed, contact me, it might be available.