Port size rpm performer manifold question

Duster Duke Boy said

So the one on drivers side is 5/8 npt and one on pass side is 1/2 npt. just in case anyone needs that info

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Incorrect. @forphorty is correct in post #2. The hole on the driver's side is 3/8" NPT. The two on the passenger's side are 1/8" NPT and 1/4" NPT.