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estout81 · 08-23-2020, 08:42 PM

I don't think a flathead will ever see 1500 PSI cylinder pressure. A 14mm plug has about a 1/4 sq. in. surface so, .25 x 1500 = 375. Don't think that will blow out a spark plug.

08-23-2020, 08:42 PM	#43
estout81 BANNED Join Date: Jun 2010 Location: Utica, Ohio Posts: 522	Re: AutoLite 216's in Offy heads I don't think a flathead will ever see 1500 PSI cylinder pressure. A 14mm plug has about a 1/4 sq. in. surface so, .25 x 1500 = 375. Don't think that will blow out a spark plug.