IDK. But, whichever size, install Marine Brass plugs. They won't rot like steel ones.On Wed, Jul 16, 2025 at 11:36 PM 'leslie miklas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:--Can anyone tell me offhand the correct size of 300C 392 block plugs ?1-5/8" ? , 1-41/64" ?ThanksJeff Miklas
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