Daves1940Buick56S Posted July 14, 2018 Share Posted July 14, 2018 (edited) I have come into possession of some NOS AC R47S spark plugs. They differ from the 47 in that the electrodes are "extended tip" and protrude about 1/8" or so into the combustion chamber. Has anyone used any of these plugs into the 320 1938 or later? Cheers, Dave Edited July 14, 2018 by Daves1940Buick56S (see edit history) Link to comment Share on other sites More sharing options...
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