Looking to cross reference an Autolite racing plug with an NGK plug
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^ It depends on the head style. Factory heads (IIRC) call for a tapered seat plug while many aftermarkets (I know my DART's and my buddy's TFS heads) call for a gasket seat plug. We both ran tapered plugs to only find out we should have been using gasket plugs
Did not damage the heads though (from what we could tell).
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