The below engine parts Cummins cylinder head are  for the 4BT3.9/6BT5.9/6CT8.3/6LT8.9/ISDe/ISLe/ISZ/M11/NT855/ KT19/KT38/KT50/ISF2.8/ISF3.8/ISM11/QSM11 series Cummins engine. DCEC cylinder head 3966454 DCEC cylinder head 3977225 DCEC cylinder head 3977225 DCEC cylinder head 3977600 DCEC cylinder head 3977600 DCEC cylinder head 4929518 DCEC cylinder head 4929518 DCEC cylinder head 4929520 DCEC cylinder head 4929520 …