[FWDLK] Spark Plugs Heat Range
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[FWDLK] Spark Plugs Heat Range



What Everett says is true.  In addition, there are "extended reach" plugs in both hot & cold ranges.  The extended reach design was developed as an assist to maintain good flame fronts in higher compression engines, and to help keep the tips cleaner.  It should be noted, as well, that the heat range is not a specific designator, it is only a comparitive value based on relationship to other, similar plugs made by the same manufacturer.  The general idea is to use a cooler plug when using the car in racing, highway, or other sustained high load use.  The hotter range is for more around town and lower speed uses.
 
My 2¢ worth
Mike Higgins
1955 Belvedere Sport Coupe



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