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I think that is an old wives tale like not swimmng for an hour after you eat. From the days of knurling piston skirts and knurling valve guides.
Forgive me, but why would you knurl either of those??
 

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years ago, it was done when labor was cheap and parts were expensive comparatively. By knurling the piston skirt on a lathe, as the tool was forced into the aluminum it would force some material outward increasing the OD of the piston slightly to fit tighter in the cylinder.
On guides the knurling tool looked sort of like a metal Q-tip and was forced into the valve guide, as the hard knurl was forced in the diamond pattern caused some of the softer guide metal to raise and make a tighter fit.
I believe they stopped doing this in the 50s -60s.
Like lapping valves. How many times have you lapped the valves? Nowadays the equipment does a good enough job that lapping with valve compound isn't used frequently.
 
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