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Todd,
Tight clearances will do damage (burned valves). Loose clearances, not so much (within reason, of course). They would need to be pretty far off for you to notice a power difference IMHO.
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Jacob
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
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