Caterpillar C3.3B 4 cylinder turbo diesel Engine Cat C 3.3 B Diesel engine this is out of a 2021 Cat 289D3 and less then 500 hours The engine has been completely inspected new head bolts and head gasket new rings and valve seals . All 4 cylinders are over 400 psi and as good as new and we will gladly stand behind . Some models interchange call for availability.