Well let me ask you this! How stupid would it be for me (or anyone) making a suggesting without first qualifying just what you HAVE? Anyhoo, I'll say what you got is going to be an AC DELCO #2 Rapidfire plug with a special tip that is gapped at the factory at .045". and should not be jacked with, excepting defects or something of that nature...Otherwise, same rules apply only the conventional plug is most likely an R45TSX that gap at .060". These seat (tapered) differently than the numbers I mentioned in my earlier post that are plugs that use a gasket to seal. As I know it, the 6X heads wont offer any clearance issue as they have big chambers. At least the ones I'm familiar with.
