Ford Motor Company 9S4Z-6505-A Engine Exhaust Valve (part number 9S4Z-6505-A; cross-reference 5155405) is a replacement exhaust valve for Ford engines. It governs exhaust gas flow through the cylinder head and helps restore proper valve seating in compatible Ford powertrains. The part numbers 9S4Z-6505-A and 5155405 identify this valve for accurate selection during repair or overhaul.
