is there a visual diff. between the stock e7 and gt 40 iron heads
 

with the heads and valve covers on the car can you tell if they are gt 40's or e 7's

3 vertical lines on the front are cast into the head. Also, near the #1 spark plug there are the letters "GT" cast into them.

Hey red, that was almost helpful. I have the stock heads on (well, not really, they're beside my car right now) my car and they have the GT and 3 vertical lines, and they are stock Cobra heads. I guess that would make them GT-40's. Although I don't know if they are the GT-40P heads or not, or if there is even a difference. It really doesn't matter though. Neither are AFR 185's, or TFS High Ports.

Later.

GT-40 P's will have 4 bars on the end of the head and have GTP cast into them...

take care,
adam