Cummins 6B, 6BT and 6BTA cylinder head new, comes with valves and springs. For marine application only. For engines with CPL #s 599, 600, 698, 713, 715, 742, 792, 834, 912, 940, 953, 970, 961, 962, 983, 998, 1174, 1209, 1518, 1523, 1524, 1570, 1581, 1613, 1928, 1975, 2050, 2530, 2891, 8206, 8457.