Off Topic Somewhat.
Longevity....
Years ago when I Bracket Raced regularly, I would freshen my engine every year. What I found was that the coated piston tops could be cleaned in a parts washer with 0000 steel wool for three or four rebuilds before the coating would begin to wear through on the edges. The Pistons always looked like new once the carbon was removed.
I never replaced a piston unless the ring groove to ring clearance (Radial Clearance) got too great.
Larry S.
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