JEGS Aluminum thermostat housing fits small block Ford engines (289, 302, and 351W) and allows the use of an -16AN upper radiator hose. Revised design uses an o-ring instead of a gasket to seal at the intake manifold. For racing use since there is no provision for a thermostat or a bypass. Includes billet thermostat housing, -16AN fitting, stainless cap screws, and O-rings and black anodize finish. 1/pkg.