Grind the valve face to the correct angle using a valve refacer [Figure 70-80-28].
Clean the valve seat and combustion chamber.
Install the valve into the guide. Measure the valve recessing or protrusion with a depth gauge [Figure 70-80-29].
If the measurement exceeds the allowable limit, replace the valve or cylinder head [Figure 70-80-30].
Grind the valve seat surface in the cylinder head to the correct angle [Figure 70-80-31].
Check the seat surface and valve face (Item 1) [Figure 70-80-32].
(a) identical dimensions above and below the valve seat
If the seat surface (b) is too wide, use a 30 degree cutter (Item 2) on the intake, and a 15 degree cutter on the exhaust to get the correct width (Item 3) [Figure 70-80-32].
Valve Seat Width
Intake 0.0835 in. (2,12 mm)
Exhaust 0.0835 in. (2,12 mm)
Valve Seat & Face Angle