Dodge D250 1990 Service Manual page 353

Alternative Repair Procedures
Page9K-22
Base Engine Components
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Install the valves in their designated locations and measure the
depth of each.
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V a , v e Depth Limit (Integral and Inserted Seats)
C « 0.99mm to 1.52mm [.039 to .060 inch]
Note: Replace the valve if the depth is over the limit.
Apply a light coat of valve lapping compound to each valve and
lap each valve to its mating seat.
Remove the valves and clean lapping compound from the
valves and seats.