Gt40 cast iron heads

M

Marlboro_Man

Member

Sep 30, 2005

437

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18

Houston, TX

Jan 2, 2006

#1

• Jan 2, 2006

• #1

Well a friend of mine is pulling his gt40 cast iron heads off of his 347 in the next couple of weeks and says he will sell them to me for $250 with the cobra 1.7rr.

I'm really considering picking them up from him and having them cleaned up and getting some new springs and some hardened push rods.

1.So does this sound like a pretty good deal?

2.How can i make for sure i'm getting gt40 heads not some e7's or gt40(p) heads? Will they be stamped somewhere?

3.With a stock short block and the mods in my sig should i go ahead and have the heads ported and polished a 3 angle valve job and maybe shaved or just leave them alone minus a clean up and .

4.What springs should i get for the gt40 heads to accomadate the E-cam that i have? I'm always worried about valve float and related problems with my stock heads and what appear to be stock valvetrain with the E-cam.

5.Should i try and save for some new lifters as well? If so what kind?


Thanks ahead of time for all the help! I'm sure i'll have more questions to come so please bare with me.

Matt

 

S

SamSnyder

New Member

Mar 30, 2005

196

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Jan 2, 2006

#2

• Jan 2, 2006

• #2

Sounds like a good price to me. Only assuming there's nothing broken, and that the springs don't have high miles on them, I would just bolt them on as is. When you start talking about porting, polishing, and even doing basic head work, you're getting to the point where it would not cost much more to get some better aluminum heads. I'm running iron GT40's and an E303 with the factory GT40 springs that came on the heads, no problem. I've come up against the factory rev limiter with no sign of valve float. For that price I'd view them as a great bolt-on replacement for stock E7's. But I don't think I'd spend much money on them. And the GT40's have "GT" cast on them at the ends (I think, but I'm not going outside to look since it's raining).

 

willys1

Active Member

Dec 2, 2003

1,004

1

36

New Jersey

Jan 2, 2006

#3

• Jan 2, 2006

• #3

They should really wake up your motor if all your running is stock heads!! especially with that cam!!

 

legalize420

Active Member

May 21, 2005

1,541

1

37

South Florida

Jan 2, 2006

#4

• Jan 2, 2006

• #4

perfect for you. i paid a little over 400, jump on it. i did not read the previous suggestion

 

legalize420

Active Member

May 21, 2005

1,541

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37

South Florida

Jan 2, 2006

#5

• Jan 2, 2006

• #5

dont just bolt them on. i spent 180 at the machine shop for a valve job, new freeze plugs, hot tank, and shaved ( what is that, make the surface flat? )

 

legalize420

Active Member

May 21, 2005

1,541

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37

South Florida

Jan 2, 2006

#6

• Jan 2, 2006

• #6

anyone know the stock max lift on those springs?

 

N8Miller

I need NOS....make it 2 of the big ones

Founding Member

Jul 26, 2000

2,661

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Kingston, PA, USA

Jan 2, 2006

#7

• Jan 2, 2006

• #7

rec. lift on those springs is .500 or so.
thats a great price on those heads. Match them with some nice comp cams springs up to like a .600 lift, a 3 angle valve job and maybe shave them a bit to get your compression up to like 9.4:1 and your all set to go. You could realisticly bolt-on 30-40hp (flywheel).

 

legalize420

Active Member

May 21, 2005

1,541

1

37

South Florida

Jan 2, 2006

#8

• Jan 2, 2006

• #8

N8Miller said:

rec. lift on those springs is .500 or so.
thats a great price on those heads. Match them with some nice comp cams springs up to like a .600 lift, a 3 angle valve job and maybe shave them a bit to get your compression up to like 9.4:1 and your all set to go. You could realisticly bolt-on 30-40hp (flywheel).

Click to expand...

i heard .550

 

N8Miller

I need NOS....make it 2 of the big ones

Founding Member

Jul 26, 2000

2,661

0

0

Kingston, PA, USA

Jan 2, 2006

#9

• Jan 2, 2006

• #9

legalize420 said:

i heard .550

Click to expand...

possibly... i got too many numbers in my head

 

R

-=Red5.0GT=-

New Member

Feb 1, 2004

108

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Jan 2, 2006

#10

• Jan 2, 2006

• #10

That’s a great price... I paid 300 for mine and you’re getting the rockers too! Those things are 200 new so; I can’t say you’re not getting a good deal. Plus if you get them ported they will totally out flow the x heads. At least get a valve job and springs for good measure.

 

accidentprone86

New Member

Apr 1, 2005

189

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Westminster Colorado

Jan 2, 2006

#11

• Jan 2, 2006

• #11

How do you identify Gt 40 and GT 40 p??
I have the chance to pick up what is belived to be GT 40 heads for CHEAP, $150 with valve train!
Also if you shave the heads, do you need to get the intake shaved aswell inorder for the ports to line up?

 

carbed87

Member

Jun 5, 2005

215

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16

Jan 2, 2006

#12

• Jan 2, 2006

• #12

haha suckers, i got mine for $180 with all springs,retainers...etc and with an extra set of lifters, hardened pushrods, crane 1:6 rockers, and some extra valvecovers.

anyways answering jeremy's question (accidentprone86) the regular gt-40's will have 3 "bars" on the front casting, while the "p"s will have either 2/4 (cant remember) bars on the front casting, and the "p"s will say "gt-40p" while the others will simply say gt

 

rd

Founding Member

Jan 12, 2000

3,316

63

109

Ocean Springs MS

Jan 2, 2006

#13

• Jan 2, 2006

• #13

I have the plain old iron GT 40's and highly recommend them. They got my car into the 12's with the same cam, carb, etc as previous.

They should have three vertical bars cast on the ends. I think they have GT cast in there somewhere.

From Ford, they have 1.84 intakes and 1.54 exhausts, that you can measure.