Left.4.6 LITER 2-VALVE. Manifold stud. Right.4.6 LITER 2-VALVE. A threaded rod which is coupled with a nut in order to attach The Thermostat Housing to its mounting surface. Fastener with threads on both ends to eiTher attach The Exhaust Manifold to The cylinder head or The Exhaust pipe to The Exhaust Manifold.