I checked with Probe's website and found some ring gap info. It had a formula for gap based on bore size. They also suggested adding .005 to those numbers for boosted apps.
Suggested piston clearances was .0025 minimum to .0065 max. They said minimum was OK for NO street motor, but go looser for boosted or race apps.
I guess I have to figure out how loose to go. .0040, maybe?
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"...ridge reamer and ring compressor? Do they have tools like that?"
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