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Palooka..... .....what did I say? "You might beable to open the gap to 0.035" (vice std gap = 0.025") to take advantage of the hotter sparkie volts that electronic ignition claim to create. Iff'n it starts missing at high rpms or heavy load, or is hard to start, reduce the sparkie gap to 0.030". You can use a "FlameThrower" sparkie coil iff'n you want to turn yer tractor engine 8000rpms and run 12:1 compression. But it ain't necessary for a 2200rpm 6.5:1 flathead engine. The AutoLite AL-437 will sparkle just fine no-matter what yer sparkie coil is. The sparkie heat-range is dependant upon the engine design and the octane quality of the gasoline, NOT the magnitude of your sparkies outta yer coil. Heres the deal, it takes a certain magnitude of sparkie to jump the gap and once that magnitude is reached, them lazy electrons are gonnna jump the gap no matter how many more electric kilovolts yer coil can produce. You want a certain amount of excess sparkies to allow for normal wear and tear. And you need higher level of sparkies for wide gaps, but once you reach that minimum sparkie volts to jump the gap .....smack..... blue-snott sparkle..... And remember narrow gap less sparkie volts are needed, but remember too narrow a sparkie gap, not hott-enuff sparkie to ignite the gasoline charge under compression. Remember high compression needs hotter sparkies, hotter sparkies come from wider gaps. Understand?..... ....respectfully, Dell
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