Knurleing is a process that is cross hatched and spiral and probably other methods its more of a process title, the process of pushing into metal with a tool to create a rise
A valve guide knurle is alot like tapping threads but instead of cutting the tool pushes into the inner walls of the guides effectively making the guide temporarily to small then its reamed to size for valve operation
Its a temporary fix because the valve is now riding on top of the new knurle ridges which is alot less surface area than a tight smooth guide and if you do not have effective valve seals more oil will pass down the guide , this temporary fix will soon fade away and you will be back to the original loose guide scenario
I dont like thin liners its to easy for then to malfunction over a new chilled iron or thick yellow metal guides
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