A liquid sodium filled valve transfers heat away from the head towards the valve guide in order to reduce combustion chamber temperatures. This is the valve of choice when rebuilding motors. When working on your cylinder head, we recommend replacing the valves, valve seat rings, guides, springs, retainers and temperature sensor at the same time to reduce future labor costs. Sold individually. 6 necessary per car.
"Exhaust Valve 930 / 965 3.3 L - 41.5 Mm - Sodium Filled"