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Originally Posted by t-bird-art
You didn't say which side has the exhaust manifold crack. The 66 Bird 390 has a heat riser on the passenger side . The heat riser requires a flat surface to bolt to the passenger exhaust manifold. 62-65 Birds did not have the heat riser so they will not work. As far as 352 manifold working , maybe , if it had a heat riser but are exhaust pipe / donut sizes right? Best to get manifold offen a 66 -390 Cu In. then you know it's right.
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Thanx for the info.....you may have saved me money
purchasing an incompatible replacement. I will take your advice and look for an original. 'Preciate it.
....................Mike. (sixtsix)