1975 Dodge B100 Engine: 3.7L L6 GAS; With Extra Cooling; Cut to fit; Position: Upper;. 1976 Dodge B100 Engine: 3.7L L6 GAS; With Extra Cooling; Cut to fit; Position: Upper;. 1977 Dodge B100 Engine: 3.7L L6 GAS; With Extra Cooling; Cut to fit; Position: Upper;.