Sodium filled valves are meant for higher heat applications and transfer excessive heat from the valve head to the stem more efficiently. The head runs cooler which reduces scorched valves, pre-ignition and detonation. These are manufactured in Germany to the highest standards. Sold individually. 6 necessary per car.

This item may need to be sourced from Germany and would take 2-4 weeks to arrive. Once ordered it cannot be canceled. Please call to check stock or request expedited shipping.