im getting the gt 40 heads. i told him to keep the ported ones and to sell me the gt40s. he said their not p or x he said that their the orgional gt40 heads. he said that they flow 185 something. i dont know what thw hell he is talking about.

 

cnc ported e7s make good power and they look stock on the outside. 5.0 mustang made 34 extra rwhp with these from power heads i used a set and had good sucess

 

check this guys ported heads, the flow numbers he post are the same as GT-40X heads
for half the money. www.thumperoforangepark.com

If your going to spend a $1,000 on some GT-40X heads, I would spend another 100 or two and get on of these instead.
next up in flow are TwistedWedge, Edlebrock RPM or AFR 165's

then AFR 185's and Vic Jr.'s

 

dont get the plain GT-40 heads, thats a waste.

The better a head flows the more power its going to make
here are some flow numbers for you

Stock: 155
GT-40: 190
GT-40X: 215
Thumper ported: 215
Edlebrk RPM: 230
TwistedWedge: 240
AFR 165: 250
AFR 185: 270

get the idea?

You want to get something like the GT-40X or Thumper heads minimum

 

i just called him. he says he has the first generation gt40 heads. i dont know the difference can any yone help me with this. if it helps they are coming off a stroked 5.0 that was making 503 to the weels. i see that car all the time. no blower. dont know about the nos.

 

I'd go w/ P heads....they should be just as cheap, but flow almost as much as the X heads. If you can't find them, the 3 bar GT40's are definitely an improvement over stock.