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I don't think it will matter if you rotate the rings. If you want to be anal about it, leave the rings in the same rotation. If two gaps are close together rotate the second ring away from the gap in the top ring and call it good. Those pistons are not to dirty. You could just clean with a solvent like paint thinner. Maybe brush off the carbon with a wire brush. Be careful not to scratch the sides of the pistons too much with the brush. I have a friend with an ultrasonic cleaner tank that does a good job cleaning pistons, so that might be an option. Keep the rings organized so you can put them back in the same spots. You are going to have no problems with this set.
You could have the heads done (new valve guides) or just put in the new lower headstuds and call it a day.
-Andy
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72 Carrera RS replica, Spec 911 racer
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