Correct spark plug gap - Vintage Mustang Forums

 
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post #1 of 4 (permalink) Old 03-20-2017, 11:52 AM Thread Starter
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Correct spark plug gap

I am running Petronix in my dist (351C). The spark plug gap with original points is 35.
What is the correct plug gap with the Petronix.

70 Mach 1, 351C 4V , 4 spd , hood tach , Grabber Orange

2007 Shelby GT500 White with blue strips
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post #2 of 4 (permalink) Old 03-20-2017, 12:17 PM
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Same as the points. You've basically replace a mechanical switch with an electronic switch. The coil output remains the same.

Tom

I'm not a complete idiot, pieces are missing.
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post #3 of 4 (permalink) Old 03-20-2017, 09:21 PM Thread Starter
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Yes I changed the coil. I talked with the Petronix tech support.
They said to gap the plugs at 0.40.

70 Mach 1, 351C 4V , 4 spd , hood tach , Grabber Orange

2007 Shelby GT500 White with blue strips
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post #4 of 4 (permalink) Old 03-20-2017, 10:17 PM
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Generally, the wider the gap, the better burn the mixture will get. There is a point of diminishing returns on that however. And the wider the gap, the more stress is on the ignition system. Especially if a supercharger or turbo is involved. My HiPo's would run fine at 0.040" plug gap. But when a vintage Paxton was added, they ran better with a 0.035" gap.

If the OP is getting good performance at 0.040", I don't see a compelling reason to change that.

Z

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