Gt 40 heads tfs stg 1 cam - Ford Mustang Forums

dandeman · #1 (**permalink**) 04-18-2008, 05:23 PM

I am in the process of installing Gt40p heads on my mustang with a trickflow stage one cam .499in .510ex. i was wondering how much horsepower this is going to increase me. I will not be installing the gt40 intake because of money issues, using the stock one till i can afford the upgrade. I also am installing 1.6 ratio roller rockers. The guy i bought it from had all this stuff on his 308.But he had Lt headers he ran a 1.6 sixty foot and a 13.09 1/4 mile at 109. How much overall hp do you think i will have when this is all installed?

dee_saleen · #2 (**permalink**) 04-22-2008, 07:45 AM

Gt 40 heads should increase horsepower by around 30. With the intake change you woint see all of it until you change the intake. Remember as well, with the gt40p (Explorer)heads, you will also have to change the headers.

thathoustonkid · #3 (**permalink**) 04-29-2008, 09:39 PM

i have the same heads for my motor i'm building. i cant find headers to fit with the different bolt pattern

dandeman · #4 (**permalink**) 04-30-2008, 04:50 PM

what about the cam? how much will a trickflow stage one increase my horsepower. the guy i bought these heads from didnt tell me i was going to have to switch headers. i want to go with a holley system max II intake but i heard it was too big for these heads

thathoustonkid · #5 (**permalink**) 04-30-2008, 06:59 PM

you'll have to bro, check out how much higher the bolt pattern is. i think i'm just gonna notch my headers and gaskets to fit. the exhaust port doesnt change any.

dandeman · #6 (**permalink**) 04-30-2008, 07:24 PM

but the exhaust ports are bigger arnt they? I traded a mustang door for a pair of headers so i will l just do what you are doing an notch the headers it wont bother me any.

dandeman · #7 (**permalink**) 05-05-2008, 03:38 PM

my headers boly up fine to the gt40p heads i dont know what you guys are talkin about

chrs · #8 (**permalink**) 05-05-2008, 04:03 PM

do do mines but i have a clearance problem with spark plugs so i have to have them extend the primaries about a quarter inch

droptop91 · #9 (**permalink**) 05-07-2008, 05:45 AM

There are several places that sell the headers specifically for the GT40p heads. Example Mustangs Unlimited part number M9430P50 FRPP, there are others. Mac, BBK and others make these headers specific for that application in the fox and SN-95.