The newer black gaskets with the steel sheet in the middle measure up around 0.5mm when new. They do compress a bit once torqued.
As you've said.. The piston doesn't show any signs of blow by. That's great! But the skirt has definitely seen some action. The burn pattern on top is great.. That is what you want to see on a 2T!
Throw an A piston in it and call it done!
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