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Re: Cold spark plug.
slap in a set of ur4's.. if it doesn't ping keep them in if it does swap them out... to ur5's or the 42's.
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-'73 c/10 - Low with Go - will be complete... probably never.
-'90 2wd Blazer - well... soon enough anyways.
-'84 SWB - the daily gas guzzler.
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