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Old 04-13-2013, 11:20 AM   #21
Boost Czar
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Location: Chantilly, VA
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I've had pistons that looked perfect on the top, smoked like that, but resulted in this:

I've had others that looked perfect even after removing, but it was obvious the rings were no longer sealing.

your #4 looks bad; it looks like it's not seated evenly and rubbing in the 5 'o clock position of the photo.

on #3; looks like maybe some failure at the 10-11 o clock position on the edge of the piston...possibly melted a little.

I cant tell if it's just grim on the head pics, but all 4 look to have det on the squish area.
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