GT40X aluminum heads?

1991notchbackLX

Active Member

Dec 25, 2007

1,483

47

48

New York

Feb 23, 2009

#1

• Feb 23, 2009

• #1

can you guys school me on these heads and how they perform? i got a set in a trade that are ported and fully assembled...

the only info i can find is on the ford racing website, and of course they say they're the best head around... how do these really flow compared to Twisted Wedges or an AFR 165?? are they comparable to those heads if they're fully ported? i'd like to put another motor together on a budget and drop it into a vert roller... are these heads worth using or better off on ebay?

thanks for any info

Chris

 

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

2,487

4

0

Miami, Ok

Feb 23, 2009

#2

• Feb 23, 2009

• #2

AFAIK out of the box the gt40x heads dont flow quite as much as AFR 165s or TW heads, but if the set you have were ported. then they are probably as good or better than a stock TW of AFR

 

1991notchbackLX

Active Member

Dec 25, 2007

1,483

47

48

New York

Feb 23, 2009

#3

• Feb 23, 2009

• #3

thanks foxfan, good to know! any one else have any other experiences/opinions on these heads?

there's some pitting on them, is this a problem??

View attachment 269511

View attachment 269512

View attachment 269513

 

KamiKaziDK

Member

May 16, 2005

555

0

17

Mesa, Az

Feb 23, 2009

#4

• Feb 23, 2009

• #4

Might wanna get the pitting welded up and then milled down. If you do decide to sell them, pm me with the price.

 

wythors

Get off my lawn!!!

Founding Member

May 17, 2000

2,277

35

69

C Addle

Feb 23, 2009

#5

• Feb 23, 2009

• #5

I've been running a set for a couple of years. With supporting mods (see sig for details) my car put down 276 rwhp and 316 rwt.

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,024

1,616

194

NJ

Feb 23, 2009

#6

• Feb 23, 2009

• #6

With the right cam and intake they will exceed 300rwhp.

Do yourself a favor and take those to the head shop, and let them direct you as to what to do with them before strapping them on.
Pay whatever it costs.

In ported form, they are probably unpredictable, they are not usually the head that people spend a bundle porting.

 

jrichker

StangNet's favorite TOOL

In Remembrance. Thank you for your contributions

Mar 10, 2000

27,512

2,813

234

Dublin GA

Feb 23, 2009

#7

• Feb 23, 2009

• #7

The pitting looks like the spark plug side electrode came off and got hammered between the piston top and the bottom of the head.

 

1991notchbackLX

Active Member

Dec 25, 2007

1,483

47

48

New York

Feb 23, 2009

#8

• Feb 23, 2009

• #8

so from what you all can see, these are in completely fixable/usable condition? (i understand they're just pictures, but a best estimate would suffice) thanks!

 

KamiKaziDK

Member

May 16, 2005

555

0

17

Mesa, Az

Feb 24, 2009

#9

• Feb 24, 2009

• #9

totally, but like said before....get them to a machine shop for an estimate

 

parrish5o

New Member

Dec 22, 2008

2

0

0

Dirty South

Feb 24, 2009

#10

• Feb 24, 2009

• #10

They would not be my first choice but they are a good head. With some port work you can get some nice numbers out of them. I watched the guys at Panhandle Performance test a set with thier stage I port job on their flowbench. They were just under what a set of stock Avengers they had just tested flowed stock out of the box. I would have them checked but they look completely fixable by the pics.

 

1991notchbackLX

Active Member

Dec 25, 2007

1,483

47

48

New York

Feb 24, 2009

#11

• Feb 24, 2009

• #11

thanks for the info guys, these wouldn't be my first choice either but i couldn't turn them down as part of a trade... my main fox, the coupe in my sig, gets the best of the best, these will be used on a budget build, thanks again!!

Chris

 

Cobra912

Active Member

May 1, 2005

1,777

11

39

Wish I was anywhere but here

Feb 24, 2009

#12

• Feb 24, 2009

• #12

can't run them as is? the pitting present that much of a problem? or does it change compression ratio? need to be decked, can't they be just bolted on?

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,024

1,616

194

NJ

Feb 24, 2009

#13

• Feb 24, 2009

• #13

Cobra912 said:

can't run them as is? the pitting present that much of a problem? or does it change compression ratio? need to be decked, can't they be just bolted on?

Click to expand...

You should never just bolt on any head, that even goes for new ones.
And that rule goes double for heads with unknown work, unknown mileage, and unknown problems.
Look at it as head gasket insurance. If there is nothing needed to be done to them, it won't cost you much to have them checked out.

 

Cobra912

Active Member

May 1, 2005

1,777

11

39

Wish I was anywhere but here

Feb 24, 2009

#14

• Feb 24, 2009

• #14

sorry I should clarify. I should have worded my question better. What I was wondering was - is fixing the pitting neccessary? I know that they should be checked but is that repair neccessary?

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Feb 24, 2009

#15

• Feb 24, 2009

• #15

jrichker said:

The pitting looks like the spark plug side electrode came off and got hammered between the piston top and the bottom of the head.

Click to expand...

Those were my thoughts as well

Grady