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It is not uncommon for folks with less experience to adjust them a bit too loose. I think the decal (engine compartment, inside the deck lid) says the Porsche spec is .04" plus or minus .002". So....a little snug is okay. Yes, adjusting valves too tight can hurt engines but I have never heard of that happening on a 911. Indeed, I believe I have also heard that this gap increases as the engine comes up to temperature. And....the real danger of adjusting them too tight is that the valve never closes. You'd have to adjust them WAY too tight for that to happen. I think.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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