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the reason it goes away when it warms up is because metal expands as it gets hotter. you possibly have a piston slapping against the side of the cylinder walls(i think that is the problem on the new chevys) but as it warms up clearances get tighter and there is no room for it to wobble around. possibly worn rings? just my thoughts...
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~1980 c10 chevy scottsdale~
~2.5/4 drop 305/th350c~
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