valve problem
 

ive run into a problem..took my heads off so my friend could bring them into class (we go to UTI) and flow them. During the flowing a mishap occurs...blah blah blah.....bent exhaust valve. I figure..no problem. hes buying me a new one. He does. Its the wrong valve.. the lock groove is higher on the stem than mine... and the valve itself is shaped a little differently.(better) Now we have a problem...according to ford motorsports the valve i bought can be used in gt40 cast iron or aluminum heads... obviously not. Could they have redesigned the valves since i bought my heads 3 or 4 years ago? So now im looking for a valve. 1.54" Gt40 iron/ exhaust valve. please help... i really need to get my car back on the road. The parts guy at the dealership where i got the valve and I cannot figure out why the new one would be different from what I have.

hmm
 

I dont know a lot about valves, but i do have GT40 heads on my car. The GT40P exhaust valves are slighty smaller than GT40 valves that i know. I dont know about the length though. Are your heads stock built? Could they have been re-done with different valves at some period?
The best thing to do is to find a good machine shop that does head work, they will know whats wrong.

they're stock heads, sadly...i was supposed to get them ported while the were off but that was put aside. machine shop is a good idea. thanks ill try on monday.

You were going to flow unported gt irons:confused:
Well, mine are ported, and im still not all that happy with them, although my car makes decent power, i just thought id see a bigger improvement.
about the valve, i would just buy avalve for a 93-95 cobra, make sure the locks and reatiners are for gt-40's, cuz it seems they have weird retainers or something.
hope you fix it.