Aren't the GT-40X heads far superior to the GT-40 P heads anyway? The GT-40X heads also would use the same headers.
There is an internet article in FORDMUSCLE.com webmagazine called HEAD TO HEAD. It fairly extensively compares a wide variety of Ford small block heads and does include those two I believe. I don't have the address handy, but a search engine should easily find it.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
Last edited by Rev; 05-04-2002 at 09:54 PM..
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