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Old 02-16-2006, 07:25 PM   #1
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What is difference in autolite plugs I see alot of 104s &105s. I have 606 * (copper)
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Old 02-16-2006, 07:33 PM   #2
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The differance is heat range, your 606'* are close to stock. the more boost you run the cooler you want your spark plug to be, also you want a tighter plug gap...0.050ish
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Old 02-16-2006, 07:54 PM   #3
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606 is the stock heat range.
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Old 02-16-2006, 10:39 PM   #4
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So next time I should get 105s Iguess.
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