They're obviously iron heads based on the rust on the ehaust ports. As Jack states, the ports don't appear milled and the the casting does not appear to taper in towards the outlet as D-ports do. Is it possible that these are 2" tube? Is it even possible to butt two round pipes (1.75-2.00) together and catch the outer bolt holes on a D-port flange? Without an adapter plate that is ( which does not appear to be present). Even the old SBC guys would run header adapter plates to run big tubes even with the existing spread on the center SBC ports.
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Gregg V.
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