GT-40 Head users come on in...

fastimes69

Founding Member

Jun 27, 2001

188

0

17

San Benito, Texas

Oct 10, 2006

#1

• Oct 10, 2006

• #1

I recently got some cast iron GT40's off a 94 Cobra with 31,000 original miles.I will be putting these on a rebuilt block with bolt ons.GT40 intake,E-cam,pullies, exhaust,65mm TB,etc,etc.My question is it possible to run 12's with these heads unported and with bolt ons.This set up is going in a stripped 89 LX hatch,5 speed that will be used for racing only with a dual stage NX N2O.I know there are several guy's out there with P heads but my question is for the regular GT40 head users.What set up do you guys run and what are your times?

 

90

Active Member

Sep 24, 2006

0

1

43

Michigan insane asylum

Oct 10, 2006

#2

• Oct 10, 2006

• #2

i have the original iron gt40's but i havent taken it to the TRACK yet!

 

MAC'n89Blckstng

Active Member

Jun 11, 2003

1,012

3

36

NJ

Oct 10, 2006

#3

• Oct 10, 2006

• #3

I have the EXACT same setup, I went 13.8 so far with a little boggy launch, I think its goof for a 13.6-13.7

 

carbed87

Member

Jun 5, 2005

215

0

16

Oct 10, 2006

#4

• Oct 10, 2006

• #4

yeah, i had similar mods and couldn't break a 14.7 at 5280ft... so maybe with more mods, but i dunno

 

oldschool88vert

New Member

Sep 1, 2006

41

0

0

lafayette, la.

Oct 10, 2006

#5

• Oct 10, 2006

• #5

how much is the car lightened? that can make a big difference too. and how big a shot.

 

25thmustang

Mustang Master

Sep 5, 2003

2,021

85

99

Montgomery, NY

Oct 10, 2006

#6

• Oct 10, 2006

• #6

That combo should be good for 240-250 rwhp, and deep 13s if not 12s on a tire. Cars rarely run the best pass on the first or second outing, so take that into consideration!

 

MAC'n89Blckstng

Active Member

Jun 11, 2003

1,012

3

36

NJ

Oct 10, 2006

#7

• Oct 10, 2006

• #7

I cant shift fast either b/c Im affraid Im going to grenade another T-5

 

mob

the guy who hits on his mom

20+ Year Stangneter

Oct 3, 2003

2,566

136

104

Dallas, TX

Oct 10, 2006

#8

• Oct 10, 2006

• #8

stock intake? If you get a cobra or explorer intake, slicks and powershfting you should hit 12's, with the nitrous deep 12;s

Just saw you had the gt40 intake

 

rd

Founding Member

Jan 12, 2000

3,316

63

109

Ocean Springs MS

Oct 10, 2006

#9

• Oct 10, 2006

• #9

My 82 runs 12.90 or so on motor with a set of these raggedy old iron heads off a 94 Lightning truck. I have a 1986 cam and not a lot of compression. I did mill them 25 thousanths. Has run 7.80's in the eighth on spray.

I think these are some of the best iron 5.0 heads out there. They bolt on easily, are a definite upgrade, and seem to be durable.

 

25thmustang

Mustang Master

Sep 5, 2003

2,021

85

99

Montgomery, NY

Oct 10, 2006

#10

• Oct 10, 2006

• #10

Great heads for a street set up!

 

fastimes69

Founding Member

Jun 27, 2001

188

0

17

San Benito, Texas

Oct 10, 2006

#11

• Oct 10, 2006

• #11

The LX my cousin and I are building has been gutted.No carpet,door panels,back seat,all A/C stuff under the dash has been removed,front and rear bumper supports,sway bar removed,and still trying to remove other stuff but we're out of ideas.It will have a cowl hood and looking into getting a fiberglass hatch.It is very light as it is already.The NX dual stage kit we have is adjustable if I remember correctly from 100-300 shot !We plan on going with a 300 shot once it is running.We hope it will run low 11's to high 10's once we get it running.It will be a track only car.

 

fastimes69

Founding Member

Jun 27, 2001

188

0

17

San Benito, Texas

Oct 10, 2006

#12

• Oct 10, 2006

• #12

Oh and this same car ran 11.70's with a different set up before.It was a stock engine,stock heads,stock cam,rockers,throttle body,air meter,FPR,everything on the engine was factory stock with 5 speed.The mods were 1 5/8 shorties ,h-pipe,4.10's,9 in K&N conical filter,short belt with a 3in race crank pulley,electric fan,and a 150 shot of N2O.On motor it went 13.10's at 103mph.It could have gone quicker with some tuning.So we should run quicker with our new planned set up..

 

5ive.oh

Founding Member

Feb 23, 2001

195

0

0

Rocky Mountain House, AB

Oct 12, 2006

#13

• Oct 12, 2006

• #13

I have ported GTP's and am able to beat my friends 06 GT with 4.10's, a CAI, diablo tune and flowmaster exhaust. I do it on 205 street tire too.