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I was trained by Porsche and can say that they were specific about clearance. But not 0.004in, rather 0.01mm which is 0.0039 inch. Or a "tight" 0.004 inch.
So how does one explain the engine decal stating a range? Well, Porsche is a small company and I've found they often have (gasp) some disagreement about the details. The 0.01mm needs to be exact when assembling an engine with new or refaced components.
I have measured these a few days later after just a few miles and yes they will be different from what they were set at. So my belief is that a range is okay and looser is better than too tight. You have to be careful with turning the engine over with removed plugs since carbon fluff can get between valve and seat throwing off measurement.
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Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
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