Reply to "My engine strarted popping last night."

icoleMember

Thanks I had to get the same plugs because the guy at the auto store did not know an equivalent but hotter plug, and the current NGK R5671a-7 is the hottest they make. They do not have 6 or lower, which means higher in NGK world. I found out that the autolite 3935 is equivalent to the 7 but that is there hottest on that plug. If anyone knows similar plugs that would be great. If I find one with the correct thread and shape and an NGK heat rating of 5 or 6 is this all that matters, or are there other factors?

10/20/112:02 PM

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