totally unported gt40x heads made 57X hp on my 302 with a s trim and 12 psi they are a decent entry level head, they dont flow anything like my new heads (Yates c3's and Yates SC1) but they are a really good budget head. hell i went 10.47 with a pair of em in a street car

 

yup... like kid says.... you can quote flowcharts all day long

i can tell you i have been in the 5.0 game since 1990 when i bought my '90 gt

i have yet to see a "p" headed car do anything impressive.

on the other hand, i have personal experience in cars going 11's on gt40 heads. mild ported with stock cam (125 shot yes) but stock cam, box stock 40 intake , mildly ported 40's, and 24's with a 75-ish meter.

 

Whats funny about people speaking about their times with the GT40's is alot of newbs in the game don't realize how much far some suspension work can get ya lol. I am hoping to hit 12's with mine once I get some tires and more driving time.

 

this is very true