Copper cup plugs are available from Summit Racing . I installed them on my '64 361. Best, Rom Kurtz E #292 ------------------------------------------ On Fri, 10/20/17, Ray Jones 1970hurst@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: Subject: Re: [Chrysler300] 413 Welch plugs To: "Richard Vitek" <rpvitek@xxxxxxxxxxxxx> Cc: "Intl 300" <Chrysler300@xxxxxxxxxxxxxxx>, "Ray Jones" <1970hurst@xxxxxxxxx> Date: Friday, October 20, 2017, 11:27 PM Not sure why you want to use disc rather than cup plugs. Cup plugs are more foolproof, and are easier to set and keep in place. Back in the day when I replaced any of mine, I used Marine Brass cup plugs.413 is a very popular engine, so they should be readily available, in steal or Brass. On Fri, Oct 20, 2017 at 3:47 PM, 'Richard Vitek' rpvitek@xxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: Anyone know of a good source for Welch plugs (expansion/freeze/core),( disc, not cup type,) for an early 413? Counterman at NAPA and some other stores unable to help. Thanks. By the way, are these sized nominally the same as the cup type for the same size bores? -- Ray Jones. Y'all come on down an see us. 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