Various diesel engines are available. The quality is excellent. Compatible Cummins engines availa Various diesel engines are available. The quality is excellent.Compatible Cummins engines available:1) 4BT, 4BTA, 4BTAA 2) 6BT, 6BTA, 6BTAA 3) 6CT, 6CTA, 6CTAA4) NTA855 Complete Engine for Cummins 4BT-3.9