what kind of +HP are you looking at with a gt40 manifold?

[FoxFiveO88]

what are the specs of a gt40 manifold...what kind of extra HP is typical for these intakes?

 

[Dino Dino Bambino]

The HP gain (or loss) will depend on the mods that you already have. On a near stock 5.0 with a stock intake, the GT40 intake might be worth a 6-8rwhp gain.

 

[87WhiteStang1]

With minor mods like exhaust, UD pulleys, Cold Air intake what kind of HP is the GT40 upper and lower intake manifold worth?

 

[Sicarius428]

The stock intake is the biggest bottleneck for the stock motor followed by the heads. You will probably get 10-15 rwhp with just the intake but you really won't see the benifits till you get rid of the stock heads.
Kevin

 

[FoxFiveO88]

my mods are listed....i also have ported and polished stock e7 heads..

 

[stykthyn]

with gt40 heads and intake you should see about 270-90 depending on cam, tune, and supporting set up.

 

[87WhiteStang1]

is there any intake manifold that would give a better hp gain on a car with stock heads?

 

[mavmavv]

No, GT40 is most likely the best intake for a stock headed car. Stock heads blow though

I wish I could nut up and buy some real ones.

 

[jhonda]

I picked up 13whp peak but gained an avg of about 12whp and 13wtq from 3000rpms and up

 

[jhonda]

I picked up 13whp peak but gained an avg of about 12whp and 13wtq from 3000rpms and up

 

[Dino Dino Bambino]

is there any intake manifold that would give a better hp gain on a car with stock heads?

The Edelbrock Performer intake probably would. It outflows the Cobra intake even though it also has small diameter runners which means airflow velocity in each runner will be higher (more torque). The Eddy also provides a more even airflow distribution to all runners.

 

[1987stangman]

No, GT40 is most likely the best intake for a stock headed car. Stock heads blow though

I wish I could nut up and buy some real ones.

Yea, they are not the best in stock form but I stand behind my E7's that have been worked by Thumper Performance. I have the Cobra intake with the lower port matched to the heads. I put that Cobra intake on with just full exhaust about 2 years ago and noticed only a small gain in power but when I got my new combo I am pretty happy with it so far. I would say get the GT40 and use it. It will help you a small bit now but it will complement and big changes you make in the future. Just my O2

 

[stykthyn]

send your stock lower to TMOSS to get ported. it will most likely be cheaper than a gt40, then slap on some gt40 irons. you will notice an immediate impovement throughout the entire powerband.

 

[Dino Dino Bambino]

my mods are listed....i also have ported and polished stock e7 heads..

I make it 269rwhp/304rwtq with the ported stock intake and 278rwhp/306rwtq with the Cobra.

 

[1987stangman]

send your stock lower to TMOSS to get ported. it will most likely be cheaper than a gt40, then slap on some gt40 irons. you will notice an immediate impovement throughout the entire powerband.

Get some GT40 iron and send your stock lower to Thumper and get them both ported, or spend a few more to get some AFR's.


Start out with the intake and grow in time. No rush!

 

[stykthyn]

Thumper ports intakes now?

 

[justintx75]

Get some GT40 iron and send your stock lower to Thumper and get them both ported, or spend a few more to get some AFR's.


Start out with the intake and grow in time. No rush!

do you have any track times w/ that combo?

 

[stykthyn]

pm thumper460. he is a head porting guru and he has built many 12 second combos using stock parts. granted you may need to change your cam.....

 

[FastDriver]

No offense to those who've ported out their stock stuff, but if you're going to spend the money, do yourself a favor and just move up to the better intakes. Performer, GT40, and Cobra are all excellent long runner intakes that will keep the low-end torque that will work well with stock E7s. Don't pick a high rpm intake like the TFS Track heat, Eddy RPM etc... These intake will prevent you from optimizing low-end torque, and the stock heads will prevent you from optimizing top-end power. So what your left with is the worst of both worlds, and you will gain little to nothing as a result of your bad judgment.

Don't stay with the stock stuff... yes there is an improvement to be had by porting it, but it doesn't justify the cost when the market is flooded with used intakes for roughly the same cost (250-300 bucks). Then you have a better quality intake that will likely outflow a ported stocker, and you still have the option to port out your new intake for more power later on.

Chris

 

[tmoss]

Here is a series of dyno test done on cleanLX's ported stock intake and ported stock E7 junk - if you put the right parts together, you make some pretty darn respectable power with ported stock junk.