is autolite 104s and tr6s same heat range?
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Re: is autolite 104s and tr6s same heat range?
Its been debated.... I always thought they were, the 4th Gen FAQ indicates they are. But the spark plug application thread stickied at the top of the N2O Tech forum indicates the 104's may only be 1/2-step colder than stock, and the issue is discussed in the thread.
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