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Purdy Swoft · 06-24-2010, 05:20 PM

I agree with Mike K rotor gap is critical. Most of the reproduction distributor caps have TOO close of gap and the wider the gap the hotter the spark, to a point. If the gap is too wide you will have early coil failure. Les recommends a gap of .025, this is a safe gap as far as coil life goes but a bit conservative. I run a .035 gap with a hotter spark . I have ran one of my model A's with an 81 year old original coil and a .035 rotor gap for 10 years and NO problems. I also set the original style points with a gap of .022 and set my Champion W18 spark plugs with a gap of .035 . This all makes a big difference in the performance.

06-24-2010, 05:20 PM	#9
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Rotor gap to distributor body terminals I agree with Mike K rotor gap is critical. Most of the reproduction distributor caps have TOO close of gap and the wider the gap the hotter the spark, to a point. If the gap is too wide you will have early coil failure. Les recommends a gap of .025, this is a safe gap as far as coil life goes but a bit conservative. I run a .035 gap with a hotter spark . I have ran one of my model A's with an 81 year old original coil and a .035 rotor gap for 10 years and NO problems. I also set the original style points with a gap of .022 and set my Champion W18 spark plugs with a gap of .035 . This all makes a big difference in the performance.