Check the original pistons very carefully for cracks in the ring lands. Almost sprung for a re-ring job cause the bores were still decent but after another careful inspection i found three cracks on no. 7 piston. So since i had to buy new pistons anyway, i went ahead with .030 overbore and forged pistons. Some of the cracks are really hard to see. I used a magnifying glass to spot. From now on i run octane booster and 93 gas.
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