GT40 Iron heads?

srv1 · 03-31-2002, 01:59 PM

where is the best place to get them and the cheapest? i hear alot about the GT40 iron heads. i am interested in a set. any suggestions?

fiveohpatrol · 03-31-2002, 03:40 PM

well the normal iron GT40 heads are no longer being produced so the best place to find them is either in a classifieds section or your best bet is to scour eBay for them. They're also normally a pretty popular item at swap meets.

If you are willing to buy a new set of headers, the GT40P heads are going for a pretty good price. Summit has started carrying them completely assembled for like $540 a pair. You'll have to get a set of motorsport headers though because the spark plug is at a different angle.

hope this helps
-Drew

avbcon12 · 03-31-2002, 07:12 PM

i got my set of GT-40 heads off the classifieds.... i have since put them in along with a lot of other items and cant beleive the difference!!! DO IT!! you wont regret it...

take care,
adam

4.6l-eatr · 03-31-2002, 07:27 PM

What year and type of vehicles did they come on? Maybe you could find some still in a car at a junk yard! Just a thought!

avbcon12 · 03-31-2002, 08:09 PM

they came on cobras and lightnings as well as some boats. mine were from a 351 marine application.

the cobra heads im sure are 64cc combustion chambers and the lightnings are i think 65cc or so since they are a 351w motor... the lightning heads also come with 1/2" bolt holes compared to the mustangs 7/16".

hope this helps, it will be a real tough time trying to find them in a junkyard. i tried.

take care,
adam

Unit 5302 · 03-31-2002, 08:26 PM

The GT40 Irons had 65.5cc combustion chambers that will drop your compression ratio from 8.9:1 to 8.75:1. The irons flow a little less than the GT40P's, about 185-190cfm intake, and about 130cfm exhaust.

A solid head, if you pick it up for under $400. Otherwise, getting a new set of GT40P's for $500, then adding the headers is probably the way I would go. Oh, and I'd also have the irons decked for some actual compression.

Tomzilla · 04-02-2002, 03:32 AM

Quote:

Originally posted by avbcon12
the lightning heads also come with 1/2" bolt holes compared to the mustangs 7/16".

Not completely accurate as my heads came off a 94 Cobra and they had 1/2" bolt holes.

PKRWUD · 04-02-2002, 05:24 AM

FWIW, the GT-40P heads have both smaller exhaust valves and smaller combustion chambers, than the regular GT-40 heads.

Take care,
-Chris

avbcon12 · 04-02-2002, 08:29 AM

http://www.geocities.com/MotorCity/Pit/5755/gt40p.html

adam

03-31-2002, 01:59 PM	#1
srv1 Get down..... Join Date: Apr 2001 Location: Room 103 Posts: 2,095	GT40 Iron heads? where is the best place to get them and the cheapest? i hear alot about the GT40 iron heads. i am interested in a set. any suggestions? __________________ Cobra brakes are on! Finally..... ------------------------------------------------

03-31-2002, 03:40 PM	#2
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	well the normal iron GT40 heads are no longer being produced so the best place to find them is either in a classifieds section or your best bet is to scour eBay for them. They're also normally a pretty popular item at swap meets. If you are willing to buy a new set of headers, the GT40P heads are going for a pretty good price. Summit has started carrying them completely assembled for like $540 a pair. You'll have to get a set of motorsport headers though because the spark plug is at a different angle. hope this helps -Drew __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

03-31-2002, 07:12 PM	#3
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	i got my set of GT-40 heads off the classifieds.... i have since put them in along with a lot of other items and cant beleive the difference!!! DO IT!! you wont regret it... take care, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

03-31-2002, 08:09 PM	#5
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	they came on cobras and lightnings as well as some boats. mine were from a 351 marine application. the cobra heads im sure are 64cc combustion chambers and the lightnings are i think 65cc or so since they are a 351w motor... the lightning heads also come with 1/2" bolt holes compared to the mustangs 7/16". hope this helps, it will be a real tough time trying to find them in a junkyard. i tried. take care, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

04-02-2002, 05:24 AM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	FWIW, the GT-40P heads have both smaller exhaust valves and smaller combustion chambers, than the regular GT-40 heads. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

03-31-2002, 07:27 PM	#4
4.6l-eatr Registered Member Join Date: Dec 2001 Location: Janesville Wi Posts: 33	What year and type of vehicles did they come on? Maybe you could find some still in a car at a junk yard! Just a thought!

03-31-2002, 08:26 PM	#6
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	The GT40 Irons had 65.5cc combustion chambers that will drop your compression ratio from 8.9:1 to 8.75:1. The irons flow a little less than the GT40P's, about 185-190cfm intake, and about 130cfm exhaust. A solid head, if you pick it up for under $400. Otherwise, getting a new set of GT40P's for $500, then adding the headers is probably the way I would go. Oh, and I'd also have the irons decked for some actual compression.

04-02-2002, 08:29 AM	#9
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	http://www.geocities.com/MotorCity/Pit/5755/gt40p.html adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

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