GT40 on a 331?

9

95saleen95

New Member

May 31, 2004

27

0

0

Sacramento, CA

Jun 3, 2005

#1

• Jun 3, 2005

• #1

Do you guys think that a GT40 intake with a 1" spacer will handle a 6,000 rpm 331 with edelbrock heads?

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jun 3, 2005

#2

• Jun 3, 2005

• #2

YES......It would work

Would it be the best choice......NO

Later
Grady

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

4

78

Summerville,SC missing South Fl. weather :(

Jun 3, 2005

#3

• Jun 3, 2005

• #3

final5-0 said:

YES......It would work

Would it be the best choice......NO

Later
Grady

Click to expand...

Exactly you WILL be leaving hp/tq on the table. Although they look real good for a 331 they fall short (even with a 306 with out being ported) imo.

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

6,819

64

129

New York

Jun 3, 2005

#4

• Jun 3, 2005

• #4

Will it rev to 6000? Yes

Will there be power there? Hell no.

I understand if your on a budget and you have the gt40 and wanna use it, go ahead. It is in no way shape or form gonna make good power though. At least ditch the 1" spacer. That intake has already too long of a runner, why make it longer?

What exactly are you building?

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Jun 4, 2005

#5

• Jun 4, 2005

• #5

Here is a dyno on a 347 with a GT40 and a TFS-R. Notice how the GT40 holds a substantail edge through 5,500 rpm. The GT40 is a very good intake for a street driven engine.

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

6,819

64

129

New York

Jun 4, 2005

#6

• Jun 4, 2005

• #6

Heres another 347 example with a tfs R intake and TW heads with a custom cam designed for low end torque. Buddy rawls did the camshaft.

Its all in the combo, saying one intake is "better" just by posting one dyno graph example is just plain silly. Its ALL in the combo. If the cam dynamics don't change there isn't enough info to say one intake is "better to 5500" than another intake.

Heres jeff88coupe's dyno with a tfs R 347 and ported afr 185's with a custom grind cam. Tremendous low speed torque and pulls to 7000. http://www.mustangcentral.net/neil/customers/jeff/jeff347.jpg

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jun 4, 2005

#7

• Jun 4, 2005

• #7

Tom

You always seem to come up with some kind of data that gives me a surprise and I for one appreciate your efforts when you share that stuff with us on this forum.

That graph was pretty interesting.

Do you think things would have been closer with one of Trick Flow's more "street car" type of intakes?

Later
Grady

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

4

78

Summerville,SC missing South Fl. weather :(

Jun 4, 2005

#8

• Jun 4, 2005

• #8

tmoss said:

Here is a dyno on a 347 with a GT40 and a TFS-R. Notice how the GT40 holds a substantail edge through 5,500 rpm. The GT40 is a very good intake for a street driven engine.

Click to expand...

Very interesting I wouldn't of though it would flow that well for a 347. What was done too the intake?

 

9

95saleen95

New Member

May 31, 2004

27

0

0

Sacramento, CA

Jun 4, 2005

#9

• Jun 4, 2005

• #9

Thanks for all the help!! Right now I have a chp 331 with ported and polished Edelbrock heads, a 570 lift cam and a TFS R manifold.My problem is the low end torque. I only drive it on the street so top end is not a hugh priority. I have my old GT40 and was just wondering if it would help my problem enough to swith them out.

 

final5-0

Mustang Master

Apr 6, 2003

6,817

12

79

DFW Texas

Jun 4, 2005

#10

• Jun 4, 2005

• #10

So......you are saying you have a lack of low end tq?

Do you have a dyno graph of the current combo?

Later
Grady

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Jun 4, 2005

#11

• Jun 4, 2005

• #11

wytstang said:

Very interesting I wouldn't of though it would flow that well for a 347. What was done too the intake?

Click to expand...

Nothing, BONE STOCK - give it to me for a couple of days and rerun the test.

Calling actual dyno test results silly - is silly itself. Everybody says this intake is no good on larger engines and it's just a lot of bunk and I like debunking things. This IS one actual example of a combo that did very well with a GT40 intake - like it or not, and NO ONE said it was "better". I've proven this intake can hang with the better intakes and so have others. The proof is hard and right out here for everyone to see. Sure you can make power other ways and some of those combos have been put up for review (they are not dyno comparisons - just one dyno). Don't listen to the "internet common knowledge" that some things don't work, because someone will prove it wrong.

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Jun 4, 2005

#12

• Jun 4, 2005

• #12

final5-0 said:

Do you think things would have been closer with one of Trick Flow's more "street car" type of intakes?
Later
Grady

Click to expand...

Might have been, but it was not tested on THAT combo, so we will never know. I do have AFM dyno tests of those intakes on a different combo though.

 

tmoss

Gettin Wired

Founding Member

Jun 28, 2001

7,153

32

128

Saint Louis, MO

Jun 4, 2005

#13

• Jun 4, 2005

• #13

I also have a dyno of that same 347 with the Holley and Victor intakes on it - here is the Holley......

 

W

wytstang

Mustang Master

Mar 14, 2004

4,988

4

78

Summerville,SC missing South Fl. weather :(

Jun 4, 2005

#14

• Jun 4, 2005

• #14

Good too know these intakes are still great street/strip intakes. Thanks for the proof .

 

9

95saleen95

New Member

May 31, 2004

27

0

0

Sacramento, CA

Jun 5, 2005

#15

• Jun 5, 2005

• #15

Yes, I am really lacking low end torque. Will the track heat upper, fit the R series lower? If so, would that be a better way to solve my problem?

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

6,819

64

129

New York

Jun 5, 2005

#16

• Jun 5, 2005

• #16

95saleen95 said:

Yes, I am really lacking low end torque. Will the track heat upper, fit the R series lower? If so, would that be a better way to solve my problem?

Click to expand...

It should fit but the track heat upper ports are smaller. I put my street/track heat upper gasket up to my R lower and it seemed to line up but the ports were a lot larger than the gasket

Sounds like you need the proper camshaft instead of blaming the manifold. I posted 2 R intake strokers with the right cam that made TREMENDOUS low end.

Have you ever been on a dyno? How's the tune? Any track times?