mmmmmm "new" heads

[GP99GT]

picked up a set of GT40 heads off a 95 cobra for $350 shipped...normally they go for $400ish without shipping, and i got a set of 1.7 rockers too that i can sell and make back almost half my money :lol:

differences are...

bigger valves. 1.78int/1.46exh on the stock heads, 1.84/1.54 on the GT40s.

http://i233.photobucket.com/albums/ee127/strngedaysNdeed/gt40/gt40heads001.jpg

bigger intake ports.

http://i233.photobucket.com/albums/ee127/strngedaysNdeed/gt40/gt40heads002.jpg

http://i233.photobucket.com/albums/ee127/strngedaysNdeed/gt40/gt40heads003.jpg

slightly bigger exhaust ports.

http://i233.photobucket.com/albums/ee127/strngedaysNdeed/gt40/gt40heads004.jpg

along with some improved runners. what this equates to, stock for stock...well heres the flow numbers.

Stock heads
Intake @ .xxx lift
.100 55.4
.200 101.3
.300 140.9
.400 150.8
.500 164.6

Exhaust
.100 42
.200 78.9
.300 102.4
.400 110.8
.500 114.2

GT40 heads
Intake
.100 54
.200 107
.300 157
.400 183
.500 192

Exhaust
.100 47
.200 94
.300 119
.400 128
.500 128

im gonna do a little work on the GT40s with some help from an online how-to and get a little more out of them, but they should be good for a few HP, especially with the blower on there.

[LTb1ow]

Strip em and get em cleaned up!

[GP99GT]

Strip em and get em cleaned up!

stupid rockers have a torx bolt in them so i have to get a socket from work tomorrow

[LTb1ow]

Poly Locks FTW. And are you massaging them yourself or sending em out?

[GP99GT]

im gonna do these myself but im sending out the lower intake

[BonzoHansen]

So much for your impure thoughts

[GP99GT]

Poly Locks FTW. And are you massaging them yourself or sending em out?


negative ont he poly locks btw...these are pedestal mount rockers. torque them down and hit torque with a certain amount of lifter preload, kinda annoying.

[ar0ck]

Man those are pretty massive compared to the stock. The car should fly as soon as you get a chance to do all the work!

[deadtrend1]

didn't i see this before with your blue one?

[GP99GT]

didn't i see this before with your blue one?

those were ported stock heads

[deadtrend1]

did ian have the gt40 heads then? someone got exploder5.0 heads .. i remember that much .. lol

[Knipps]

Put the blower on already :twisted:

[GP99GT]

did ian have the gt40 heads then? someone got exploder5.0 heads .. i remember that much .. lol

i had an exploder intake...i also have another in my garage which is going on the car when the heads go on

[Jersyboyy]

sweet deal bro now sell the heads and the car and buy that ls1 in the classifieds...impure thoughts ftw...either way w.e you do DO IT ALREADY I wanna see you (or at least hear of you) driving a fast whip.

[GP99GT]

patience my son patience

[NJ346]

woohoo, your on your way to 240HP. Haha just messin with ya. My dad had a 91GT vert and those are fun little cars and sound so sweet.

[r0nin89]

My boss has a capri with a gt40 crate 302. yeah 700hp is alot....

Those heads will do ya good.

[sweetbmxrider]

nice man good luck with that. you are getting a tune after all of this, right?

[Mike]

yeah he said in the other thread that its going to a shop for the blower install and tune

[cdacda13]

Its still a mustang. And its not 5.0 L, its actually 4.9 L.

[Teds89IROC]

looks good..get movin' ;-)

[GP99GT]

Its still a mustang. And its not 5.0 L, its actually 4.9 L.

still better than a 305

[cdacda13]

still better than a 305
That is true. Then again, so are most engines.
One day, if I ever finish my car, we'll run them at island.

[rscamaro73]

did ian have the gt40 heads then? someone got exploder5.0 heads .. i remember that much .. lol

Got those on my 99 Xploder...believe they're the GT-40P iron heads....

[NJ Torque]

thought gt-40's were aluminum... guess i was wrong.

[GP99GT]

thought gt-40's were aluminum... guess i was wrong.

ford racing makes GT-40X and GT-40Y heads which are aluminum...these are the original GT-40 heads off the 5.0 cobras/96 explorer