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my engine builder reccomended the 4v heads, he said they will come in around 2500-3300 rpm. but i have the 70 closed chambered 4v heads, that may be the diff.
For the edification of anyone else that may want to try it in the future, Hedman 88320 headers (for a 70-73 'Stang 351C) fit quite nicely on the 400 in my '72 LTD. Don't let anyone tell ya it can't be done.
p.s. Thanks again for all the information on this message board.
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