Part Type: Engine Coolant Outlet Gasket. 1951 GMC 280-22 Engine: 3.7L L6; Molded Rubber With Plastic Carrier;. 1955 GMC 280-22 Engine: 4.1L L6; Molded Rubber With Plastic Carrier;. 1952 GMC 280-22 Engine: 3.7L L6; Molded Rubber With Plastic Carrier;.