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Ole Don · 10-29-2021, 10:18 AM

The F600 with a 292, a five speed and a two speed were driven at wide open throttle against the governor through all gears, all the time. They used a colder plug because of that. This started in 55 and those trucks were driven like that until they dropped one by one and were replaced with T750 and 850 with 477's and 534's.

10-29-2021, 10:18 AM	#10
Ole Don Senior Member Join Date: May 2010 Location: St. Michael, Minnesota Posts: 1,713	Re: F10 champion plugs The F600 with a 292, a five speed and a two speed were driven at wide open throttle against the governor through all gears, all the time. They used a colder plug because of that. This started in 55 and those trucks were driven like that until they dropped one by one and were replaced with T750 and 850 with 477's and 534's.