The Explorer upper is very similar to the Cobra's. The lower is the same as the Cobra, which is the same as the GT40.
The Explorer heads are the GT-40p variety. Several tests show the GT-40p heads outflowing the original Cobra GT-40 irons. They also feature smaller combustion chambers to raise your compression ratio to about 9.5:1 vs 9.0:1 stock. That is helpful in the naturally aspirated power dept. The GT-40p's flow well on the exhaust dispite the stock HO sized 1.46" exhaust valve in good part because of the lack of an exhuast thermactor bump for the emissions system. The thermactor bump is no longer necessary due to the clean burning combustion these heads allow.
Just for clarification, the
1993 5.0HO was rated at 205hp/285lb/ft
1994-1995 5.0HO was rated 225/300 with the manual and 215/285 with the AOD.
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