mlander Posted November 3, 2006 Share Posted November 3, 2006 STUTZ AC SPARKPLUG SPECIFICATION CHART1945 ISSUEPassenger Cars---1924-1942Stutz Model 693-4-5??.78SAll Others??????..86AC 78 = 7/8?-18 by 5/8? nominal reach by # 8 heat range. S= Extended TipAC 86 = 18mm by ½? nominal reach by # 6 heat range. Link to comment Share on other sites More sharing options...
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