Are the rings on those pistons free floating or do they have guide pins? I remember something back when I was learning how to build motors that if the piston rings and the oil scraper 'line up'.. like where the ring ends are aligned with the one below it, etc.. you can get blow by. It could hold when you do a leakdown test on it, but when its running it could be a different story. Have you pulled your oil pan to see if theres anything in there?
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