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polaris sl780 checked pistons and found one that had pockmarks around the outer sides of the top. could this be from water. I would think that preignition would be more in the center of the piston i do not know
 

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Preignition will be all over. I know I melted down a ZZ502 650hp in my 23ft Nova Wellcraft. She now 30 over and turns about 680hp with some extra machine work.
 
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