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is this wear pattern normal? if u measure on the darker part on the skirt, its about .001 -.0015 smaller in diameter and didnt make contact w/the bore. all 8 look similar. could the skirt have been improperly machined?
 

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I’ve never seen that before but it’s possible it was improperly machined. Are those aftermarket pistons or gm
is this wear pattern normal? if u measure on the darker part on the skirt, its about .001 -.0015 smaller in diameter and didnt make contact w/the bore. all 8 look similar. could the skirt have been improperly machined?
 

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It's pretty common for a piston to "collapse" in the skirt area after hard or long use. But that means it was once in contact and should have some wear marks.
 

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The skirt is basically the “bearing” of the piston. It’s normal to see wear as it will rock back and forth going from bdc to tdc.
 

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Someone(machine shop) knurled the pistons in my old 23 T Bucket. I tore it down, bored it .030" and put it back together with new parts.
 
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