Clean spot on piston?

mercredi 27 août 2014

Just took the head off and noticed 3 pistons had shiny clean area on top of the piston towards the rear? About a 1/4 of the piston on one and 1/8 on the others. My question is: Is this normal? What would cause this? I have a few thoughts but wanted those that deal with the first gen to chime in.

This is a 93 intercooled motor with a 160 pump. Totally stock no mods.




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