Port size rpm performer manifold question

Duster Duke Boy said

I took them out and they measured 5/8 and 1/2

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Listen to @TT5.9mag . I just measured the RPM manifold that's on my shelf. Trust me. Pipe is measured by ID of the pipe itself, not by the thread dimensions. NPT is measured completely different than standard thread pitch. 5/8" NPT is HUGE.