Yeah, it is wiser to run a wider gap than a tighter one. Later, you can experiment by closing the gaps if you wish.
Only running .006" piston to wall? That is tight IMO. What does the manufacturer say to do? I would be worried about the skirts that tight. Run over double that number on my nitro motor. Normally run .010"-.012" on a blown gas marine set up. I've run .005" on N/A street motors with forged pistons. many think that is way too much but, the 455 lived for 181,000 miles and did not overheat.
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