[5litercobra]

what could i expect out of these over stock heads what is runner cc int. exh. what is valve dia. are they compatible with the roller cam in a ho just curious as to why these are so much better than the stock gt when they are a stock head on a different model

[1slo5.0]

Originally Posted by 5litercobra what could i expect out of these over stock heads what is runner cc int. exh. what is valve dia. are they compatible with the roller cam in a ho just curious as to why these are so much better than the stock gt when they are a stock head on a different model

Valve sizes are 1.84/1.54 compared to 1.78/1.46 on E7 heads. I do not know the intake and exhaust port volumes but the heads do flow much better than E7 heads. As with any head, you should install valve springs that are designed to work with the cam you will be using. If you are not sure what springs to use you can look at the cam card that came with the cam or call the cam manufacturer. Why are P heads better? Because they are a better design. E7 heads are a 20+ year old design and a very poor design at that.

[5litercobra]

ok i'll admit i am knew to the whole 5 oh game reformed chevy lover so i dont know what years the e7 heads came on would they be on a 95 gt or cobra i don know educate me please than i wont ask stupid rookie questions

[1slo5.0]

Originally Posted by 5litercobra ok i'll admit i am knew to the whole 5 oh game reformed chevy lover so i dont know what years the e7 heads came on would they be on a 95 gt or cobra i don know educate me please than i wont ask stupid rookie questions

E7 heads came on 87-95 5 liter Mustangs and possibly 86 models as well. GT40P heads came on 5 liter Explorers but there is a certain year range that you need to look for but I don't remember what years... 93-95 Cobras have GT40 heads.

[5litercobra]

do the gt 40's have identifiable markings on the exterior. thanks for your input

[1slo5.0]

Originally Posted by 5litercobra do the gt 40's have identifiable markings on the exterior. thanks for your input

Cast iron GT40 heads have 3 vertical lines on the end of the head. Aluminum GT40 heads have 4 vertical lines. I believe the P heads have 3 lines with the letter P but I am not sure.

[vfast]

GT

[5litercobra]

thanks dudes bye the way for future reference i did some inet searching and found the intake port volume to be 145-154cc i believe with 1.84 1.54 as darrel had stated already. Thats in comparison to the e7 with 124cc runners. thanks for the info darrel

[stanginfection]

GT-40 heads will have GT cast in the right hand corner just below the valve cover. The ones I have also have the number 67 cast into the left corner but CC out at 59cc. These were new in 95.

[ninedee-coupe]

guys im oblivious to how many valves a e7' have? is it 2 valves or 4 valves per cyl?

[1slo5.0]

Originally Posted by ninedee-coupe guys im oblivious to how many valves a e7' have? is it 2 valves or 4 valves per cyl?

2 just like the rest of the pushrod Windsor engines.