If your reffering to the gt-40 iron, like the heads that came factory on the 93-95 cobra, and early ford exploders, they arent a whole lot better, the valves are bigger 1.84 intake, 1.60 exhaust, i could be a little off on the exhaust size, the stock e7's have a 1.78 intake 1.46 exhaust, again i could be off on that, but it's close, i run the gt-40 heads, i had a mahcine shop port/polish, surface, and 3 angle valve job them, they say mine came off a 95 cobra, but the guy that sold them to me said they came off an explorer, but anyway, i can't tell you the performance they have since my car is still apart, i can let you know maybe monday, i should be threw.
I also hear the 40's respond well to porting, and to notice a big difference from e7's you need to do at least a mild port job.
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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