gt40 heads vs stock heads

[Coupe50h]

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.