340 x heads

I was wanting to know if anyone new how many thousandths the valve stems should be above the keepers?
I had to replace a cracked head that someone did a bad repair job on.
Passenger side valve stems are around 14 thousandths and drivers head which I replaced is around 10 thousandths.
I have one rocker that's making some nose on the head i replaced .
Engine is all stock with around 500 miles on it
Checked cam and lifters for wear and everything looks good.
Only thing I could see was the difference in valve stem height.

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