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Old 11-13-2019, 04:36 PM   #91
AnthonyG
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Join Date: May 2013
Location: Pa.
Posts: 2,161
Default Re: Spark Plug Protrusion into Head?

Obviously my Offy heads depth of thread different than tubman’s. The Champion N5C’s R indeed 3/4 reach and extend into the head chamber almost 4 full threads. Oh well there going back to Amazon & guessing I’ll pull the other head & just Chamfer for the Autolite 437’s
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