I.D. on Series II stock rear exhaust manifold primary? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-26-2007, 01:00 PM   #1
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Default I.D. on Series II stock rear exhaust manifold primary?

Does anyone have the inner diameter of the Series II stock rear exhaust manifold primary? Particularly right at the flange, if that'* the most restricted part?

(Better yet, a good estimate of what it would be if any ridges or welding flaws were ground out...not "ported", just smoothed...)

If, like the front manifold, it'* not perfectly circular, how about an "average" diameter?

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Old 04-26-2007, 02:49 PM   #2
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I just measured 1 5/8" at the flange and 1 3/16 inside the weld.
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