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plug gap?

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Old 01-05-2007, 04:30 PM
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plug gap?
what should the plug gap be on a 93 Z28 I dont know if the type matters but they are NGK TR55 and also what is better the copper ones or platinum?
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Old 01-05-2007, 04:45 PM
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Gap should be .050" As for platinum or copper, the platinums will last longer but are more expensive. The coppers are cheaper but will require quicker maintenance intervals.
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Old 01-05-2007, 07:43 PM
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book says .050.
i have .043 in mine
but in your case i would go .045
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