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So what's the magic number for gas( if there is one ) that everybody shoots for - or is it more of a gettim all even thing?

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Shooting for a magic number will get you in trouble.Different brands of fuel will burn differently,and some engines make better use of the burn than others.Valve timing and compression changes will change exhaust temperatures.
Keith

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I'm sure there are a lot of things that will change the EGT, but I know a few guys that use it to adjust for DA changes ( carb jetting )and also as a general tuning tool. Just assumed they had a specific # they shot for.