94-95gt vs. 94-95 cobra.

[Shocker98GT]

Out of the box GT-40X heads flow a less than 165s, and they have 178cc runners. The Z heads out of the box outflow 165s and 185s, but that's using a 204cc runner. In the end the AFRs and Trick Flows have much more potential. It's flat out sick how much power people are throwing down with as-cast AFR 185s on 351Ws and such, especially power adder applications.

 

[Schiffy]

wickedcobra- you may not like the GT40's but for $150 i can get better than stock E7 heads. i would LOVE a set of AFR's 165-205 doesn't matter, but price wise... i can't afford it, look at my avatar, i'm VERY limited to what i can spend my money on. LOL... you said when somebody said GT40 anything you stop reading, or taking advice, in my case, it's my best bet for anything, i have free porting and polishing, so why not get the Cobra intake, and the GT40 heads? send them to my guy, get some work done, and ok. cheap power. not crazy power, but better than stock, GT40 heads, Cobra intake bigger injectors and a good cam, i can make 300hp. thats all i care about.
When my little dude is older, then i'll buy some good heads, and a great flowing intake, until then, i'm limited to used GT40 parts. :dunno:

 

[Javi]

Here is a list of items that are unique to the Cobra vs the GT (94-95)


Engine/trans

The Cobra engine was under rated at 240bhp from the factory campared to the GT's 225bhp and was only available with a 5 speed and 3.08 rear end gears.

Cast iron GT40 heads
Cast aluminum Cobra intake manifold
Crane 1.7 rocker arms
24lb fuel injectors
Cobra specific ECU (computer)
"Cobra" stamped valve covers with build sticker and signature
Engine oil cooler
Front mounted power steering fluid cooler
Lightened flywheel
Phosphate coated transmission gears
Overdriven waterpump pulley
Cobra specific camshaft
Cam specs: Duration: 227°/Intake & 270°/Exhaust
Lift: .485/.485 Intake/Exhaust
Lobe separation: 118.5°

Suspension/Brakes

13" Front brakes
11.65" rear brakes
"Cobra" embossed front calipers
Cobra specific brake booster
Cobra specific rear sway bar
Cobra specific shocks/struts/springs
K-member that is slightly stiffer than the GT's
No strut tower brace

 

[94Vert]

some gt's had 3.27's also, mine is a 5 spd and has 3.08's

 

[stang94X]

Out of the box GT-40X heads flow a less than 165s, and they have 178cc runners. The Z heads out of the box outflow 165s and 185s, but that's using a 204cc runner. In the end the AFRs and Trick Flows have much more potential. It's flat out sick how much power people are throwing down with as-cast AFR 185s on 351Ws and such, especially power adder applications.

GT40-X heads: 178cc intake and 62cc exhaust : intake 250 cfm @ .550" and exhaust 170cfm .500"
AFR165 heads: 165cc intake and 69cc exhaust : intake 242 cfm @ .550" and exhaust 185 cfm @ .550"
AFR185 heads: 185cc intake and 69cc exhaust : intake 267 cfm @ .550" and exhaust 185 cfm @ .500"

gt40x heads are a great head and when ported they are awesome and ya can port those heads alot, my heads out flow the AFR185's and they could have been ported a lot more

 

[Slow95Cobra]

just throw a good cam in, change the pcm to a old fox pcm...

 

[Slow95Cobra]

Here is a list of items that are unique to the Cobra vs the GT (94-95)


Engine/trans

The Cobra engine was under rated at 240bhp from the factory campared to the GT's 225bhp and was only available with a 5 speed and 3.08 rear end gears.

Cast iron GT40 heads
Cast aluminum Cobra intake manifold
Crane 1.7 rocker arms
24lb fuel injectors
Cobra specific ECU (computer)
"Cobra" stamped valve covers with build sticker and signature
Engine oil cooler
Front mounted power steering fluid cooler
Lightened flywheel
Phosphate coated transmission gears
Overdriven waterpump pulley
Cobra specific camshaft
Cam specs: Duration: 227°/Intake & 270°/Exhaust
Lift: .485/.485 Intake/Exhaust
Lobe separation: 118.5°

Suspension/Brakes

13" Front brakes
11.65" rear brakes
"Cobra" embossed front calipers
Cobra specific brake booster
Cobra specific rear sway bar
Cobra specific shocks/struts/springs
K-member that is slightly stiffer than the GT's
No strut tower brace

you forgot shorter serp. belt and bigger throttle body... :hammer:

 

[Shocker98GT]

Out of the box GT-40X heads flow a less than 165s, and they have 178cc runners. The Z heads out of the box outflow 165s and 185s, but that's using a 204cc runner. In the end the AFRs and Trick Flows have much more potential. It's flat out sick how much power people are throwing down with as-cast AFR 185s on 351Ws and such, especially power adder applications.

GT40-X heads: 178cc intake and 62cc exhaust : intake 250 cfm @ .550" and exhaust 170cfm .500"
AFR165 heads: 165cc intake and 69cc exhaust : intake 242 cfm @ .550" and exhaust 185 cfm @ .550"
AFR185 heads: 185cc intake and 69cc exhaust : intake 267 cfm @ .550" and exhaust 185 cfm @ .500"

gt40x heads are a great head and when ported they are awesome and ya can port those heads alot, my heads out flow the AFR185's and they could have been ported a lot more

I've never seen the X heads flow that much as-cast, sometimes up to Ford's estimates but depends on the tester as always. Every test I've seen puts them in the 220-230 range on the intake side and 150-160 on the exhaust, where the AFRs flow at or beyond what the claims are, and it beats them by a long shot in average flow, which is the more important specification anyway. It's kind of like comparing an NPI head vs a PI head, an NPI head outflows the PI at peak lift, but the cam lift can't even take advantage of it. Or a B head vs a C head 4V for that matter.

This is somewhat a compilation of different head designs, while there are a lot of magazine sources, a lot of them were based on the same article in a magazine at the time, same flowbench, etc., which is better than having to cross-compare from a lot of different sources

http://www.mustangmods.com/data/995/head flows compiled.gif
http://www.jason.fletcher.net/tech/flowdata/aluminum.htm

 

[fastgtfairlane]

im with badblack95gt on the money part. im broke too lol. what kind of power could be had with a set of gt40 cast irons with some mild porting and a good 3 or 5 angle valve job. that is including supporting mods, headers eddy performer rpm u/l 24lb injectors 65mm tb cai 76mm mass air.

 

[stang94X]

my friends car with unported gt40 cast irons, the aftermarket gt40 intake (edelbrock intake is way better), fords B-cam, 24# injectors, bigger mass air( not sure of what size), 70 mm TB, headers back exhaust, underdrive pulleys, and his car is a 5-speed, IT MADE 265 HP to the tires

 

[Javi]

Here is a list of items that are unique to the Cobra vs the GT (94-95)


Engine/trans

The Cobra engine was under rated at 240bhp from the factory campared to the GT's 225bhp and was only available with a 5 speed and 3.08 rear end gears.

Cast iron GT40 heads
Cast aluminum Cobra intake manifold
Crane 1.7 rocker arms
24lb fuel injectors
Cobra specific ECU (computer)
"Cobra" stamped valve covers with build sticker and signature
Engine oil cooler
Front mounted power steering fluid cooler
Lightened flywheel
Phosphate coated transmission gears
Overdriven waterpump pulley
Cobra specific camshaft
Cam specs: Duration: 227°/Intake & 270°/Exhaust
Lift: .485/.485 Intake/Exhaust
Lobe separation: 118.5°

Suspension/Brakes

13" Front brakes
11.65" rear brakes
"Cobra" embossed front calipers
Cobra specific brake booster
Cobra specific rear sway bar
Cobra specific shocks/struts/springs
K-member that is slightly stiffer than the GT's
No strut tower brace

you forgot shorter serp. belt and bigger throttle body... :hammer:

??? :gtfo:


just kidding :rollinglaugh:

 

[OnyxCobra]

94/95 GTs and Cobras have the same size throttle body.

 

[Schiffy]

im with badblack95gt on the money part. im broke too lol. what kind of power could be had with a set of gt40 cast irons with some mild porting and a good 3 or 5 angle valve job. that is including supporting mods, headers eddy performer rpm u/l 24lb injectors 65mm tb cai 76mm mass air.

Glad somebody agrees with me... LOL

 

[rj95svt]

The cobra cam is actually not as good as the gt's! It's got more lift (mostly due to the 1.7RR) but it's got a 118.5 lobe seperation vs. the gt's 114. I have read claims that ford used this cam to make up for a slight loss of low rpm torque due to the larger heads and intake used on the cobra.

 

[Eric_94cobra]

you can port the hell out of gt40 heads and make good power, I sold my old heads to a guy that races a Sunbeam tiger in a class that mandates that kind of head, he said he was going to port the chit out of them. He must have wanted them, he paid $200. I like my afr185 heads with my stock cam and valvetrain, but they were pricey. They are already ported, there is not much to be done with afr heads.

 

[Schiffy]

Well, here's the thing, in about a year and a half i'll be starting school at SAM (School of Automotive Machinists) maybe i can get my own set of AFR 165/185 and a stock GT40 head,and a full ported GT40 head, and i can throw them on the flowbench and we'll see what they can do. of course you guys will have to wait about 2 years for those results to be posted. LOL...
Maybe if anybody has something like that, we can post it up and start a comparison?