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russcc · 06-19-2020, 05:52 AM

I did a search on prior posts, and came up with Autolite 216 with a 7/16 reach, or 0.437, and Autolite 4634 with a 1/2" reach or 0,500. If you subtract the 0.060 for the gasket, that is a 0.440 reach on the 4634. Any other options out there ? 0.750 reach or 3/4" is too long for the Navarro heads I am using. Thank you Fordbarners.

06-19-2020, 05:52 AM	#2
russcc Senior Member Join Date: May 2010 Posts: 2,871	Re: spark plug reach I did a search on prior posts, and came up with Autolite 216 with a 7/16 reach, or 0.437, and Autolite 4634 with a 1/2" reach or 0,500. If you subtract the 0.060 for the gasket, that is a 0.440 reach on the 4634. Any other options out there ? 0.750 reach or 3/4" is too long for the Navarro heads I am using. Thank you Fordbarners.