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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Exactly... E7 are a little better than E6, but the Gt40 are better than both of those by a long shot, and they're still not the best by any means
Thats because GT-40's are in essence 351w heads. GT-40's are virtually IDENTICAL to C9/D0 casting 351W heads. But to run those old heads requires some machining, - hardend valve seats, guide plates, studs.
-P.