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JE has a manufacturer disclosed margin of error of +/- .0005". If you're finding .0018" measurement on .0015" spec then the hairs are officially split. Good to go in my opinion... many race engines (not Porsche specifically) run a bit looser as a general rule which produces a smidgen more power and also gives a safety margin in competition should you get things hot and tight.
Edit: the trade-off of way too loose is cold slap. I run a larger gap on my engine with iron cylinders (different spec) and do not have slap even cold but YMMV.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
Last edited by Lapkritis; 01-27-2014 at 08:54 AM..
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