Valve Guide 993 - Exhaust - 1st Oversize - 8 mm

As valve guides age, they lose their ability to locate the valve to the valve seat. That can create a loss of performance due to the ineffective seal of the combustion chamber. Be sure to replace your guides when replacing valves, valve springs, etc. Inside diameter 7.9mm, re-work required. Sold Individually. 6 Necessary Per Vehicle.