2 types of GT40 iron heads, not talking abou the P

Hethj7 · 05-02-2004, 12:21 PM

I am just finding out that the GT40 head found on the Cobra had 60cc combustion chambers while the GT40 head from the lightning or crate motors had a 65.5cc combustion chamber.

Most things I read never distinguish between these heads, they just simply refer to the GT40 iron heads. So, is this info correct and what other differences are there between the Cobra and truck versions of this head? And, were these (the cobra, lightning, and crate motors) the only sources of the GT40 irons?

Hethj7 · 05-03-2004, 01:22 PM

red82gt · 05-08-2004, 01:53 AM

I posted on the other thread about this, no definite answer but some decent info none the less.

Hethj7 · 05-08-2004, 11:30 PM

Thanks man, I will check it out!

mjacoby321 · 10-04-2010, 11:00 PM

I think it depends on the make of the GT 40 iron heads and their difference is seen on the combustion chambers, thus their improvement is seen on the engine performance.
__________________
ford mustang parts

88workcar · 10-26-2010, 09:16 PM

If you need it I have one GT-40 head here, big valves and fully ported. The set ran in the tens before I got them and trashed one.

05-02-2004, 12:21 PM	#1
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	2 types of GT40 iron heads, not talking abou the P I am just finding out that the GT40 head found on the Cobra had 60cc combustion chambers while the GT40 head from the lightning or crate motors had a 65.5cc combustion chamber. Most things I read never distinguish between these heads, they just simply refer to the GT40 iron heads. So, is this info correct and what other differences are there between the Cobra and truck versions of this head? And, were these (the cobra, lightning, and crate motors) the only sources of the GT40 irons? __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

05-03-2004, 01:22 PM	#2
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	ttt __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

05-08-2004, 01:53 AM	#3
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	I posted on the other thread about this, no definite answer but some decent info none the less. __________________ 393W: AFR 205's, hydraulic roller, TKO600.

05-08-2004, 11:30 PM	#4
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Thanks man, I will check it out! __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

10-04-2010, 11:00 PM	#5
mjacoby321 Banned Join Date: Sep 2010 Posts: 15	Re: 2 types of GT40 iron heads, not talking abou the P I think it depends on the make of the GT 40 iron heads and their difference is seen on the combustion chambers, thus their improvement is seen on the engine performance. __________________ ford mustang parts

10-26-2010, 09:16 PM	#6
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Re: 2 types of GT40 iron heads, not talking abou the P If you need it I have one GT-40 head here, big valves and fully ported. The set ran in the tens before I got them and trashed one. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

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