Those are thermactor fitting holes that are in the back of your mustang heads and yes the "P" heads have all the provisions except for the tapped hole. If you look at some of the suppliers for the "P" heads they offer to machine this into the heads for an additional fee (100.00) I think.
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93'GT 5spd.
Underdrives, FMS clutch, adjustable quadrant,Flowmasters, Kenny Brown subframe connectors, 3.73 gears, Steeda Tri-Ax. JBA shorties, BBK h-pipe. More to come.
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