340 1.88 intake valve coloration normal?
After cleaning up the intake valves in a used 340, found a pretty rainbow hue to them. They don't appear to be bent, warped, or melted. They still have plenty of margin left. Is this color unusual for a used valve? Thank you.
After cleaning up the intake valves in a used 340, found a pretty rainbow hue to them. They don't appear to be bent, warped, or melted. They still have plenty of margin left. Is this color unusual for a used valve? Thank you.