1. REPAIR VALVE SPRING SEAT
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If the seating is too high to the valve face, use 30° and 45° cutters to correct the seat.
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Intake Side: If the seating is too low to the valve face, use 60° and 45° cutters to correct the seat.
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Exhaust Side: If the seating is too low to the valve face, use 75° and 45° cutters to correct the seat.
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Hand-lap the valve and valve seat with an abrasive compound.
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After lapping the valve by hand, clean the valve and valve seat.