long tube headers?

[955.0]

I have a cracked header now, I was thinking of getting long tubes and an X pipe instead of the H I have now. Any thoughts

[coralcoupe1993]

What are you plans for the car?

[955.0]

The only near future Ideas I have is a Trick Flow top end porbally this winter, and a supercharger down the road as in next winter. Thanks for the reply

[coralcoupe1993]

The only near future Ideas I have is a Trick Flow top end porbally this winter, and a supercharger down the road as in next winter. Thanks for the reply

I have a full trickflow set up on my notch and I am running shorties, prochamber and pro dumps.

[955.0]

Do you like the Trickflow top end?

[Silverhatch]

The longtubes will kill your N/A low end. You'll feel a difference up top though, and it will sound badass.

[wick]

I have long tubes on mine. MAC 1 3/4. Motor is mostly stock aside from a cam, rockers and a tiny bit of grinding on the heads and GT-40 intake. It runs good and sounds good from what i have been told.

[bspilner]

i have a set of mac 1 5/8 long tubes modified for a 1" intake spacer if interested

[Silverhatch]

i have a set of mac 1 5/8 long tubes modified for a 1" intake spacer if interested

I have been out of the 5 liter game awhile, but what does the intake spacer have to do with the headers?

[Pure Stock]

The longtubes will kill your N/A low end. You'll feel a difference up top though, and it will sound badass.

Where did ya here that???

[wick]

Where did ya here that???

For the egr. Its on cylinder 3 or 4. A tube runs up to the egr valve from the header tube. He probally either blocked it off or made a longer tube for it.

**Oops, wrong quote.**

[coralcoupe1993]

Do you like the Trickflow top end?

The motor is great! I haven’t had it on the rollers but should do good. Its Trick Flow TW heads, Track heat intake w/ 1" spacer, Steeda #18 cam, rollers, 24# injectors 70 TB, 76 mil MAFS, MSD, and stock rotating assembly.

If I can get house and work projects done and devote a day to it, I should get her to the track.

[955.0]

Thanks for the reply, how much would you want for them?

[Killercanary]

The longtubes will kill your N/A low end. You'll feel a difference up top though, and it will sound badass.

That is the first time I've ever heard that. I don't have time now but I'll post up side by side dyno graphs later showing that just the opposite is true.

[Viper_ed]

That is the first time I've ever heard that. I don't have time now but I'll post up side by side dyno graphs later showing that just the opposite is true.

Hugh, I alsway thought you will lose low end tq. and pick up top end hp.

[coralcoupe1993]

Hugh, I alsway thought you will lose low end tq. and pick up top end hp.

Yea, I heard that too. Maybe it is true with lower power motors such as 4 cyl???

[Pure Stock]

I'd like to take the time to explain how the exhaust side of an engine mimics a bell curve. Using the exhaust as a tuning tool becomes necessary when trying to extract the maximum power from a combo. For example it is possible to lose power from underscavenging the cylinder head chamber and a loss of power could also be had from overscavenging. When over-lap occurs (intake and exhaust valve open) the exhaust system needs to be sucking the spent gases from the chamber and start the intake charge coming into the chamber. If you have a *header* that produces an over-scavenging affect it will pull too much of the intake charge out of the chamber OR if the *header* does not have enough airflow (underscavenging) the residual gases will remain in the chamber. This is where potential power losses could occur. Now not only does the header affect the bell curve. The exhaust valve diameter, exhaust port size, exhaust port shape, and cam duration/ lift will also affect the bell curve.

Getting back to what was stated previously. With a properly chosen exhaust system and taking into consideration the theory above a 1 5/8" long tube header will pick up power across the entire rpm band over a shorty style 1 5/8” header on a stock long blocked application. I have had the opportunity to view shorty vs. longtube 1 5/8” header dyno tests on stock long blocked efi 302’s. From where the test started around (2,000 rpm) to the cut off point (5,500 rpm) the avg. power increased with the longtubes.

To illustrate how easily one can over shoot or under shoot on header size I will be assessing three different sizes of longtube headers on a chassis dyno in the future to determine what size fits my application i.e., produces the most avg. power in the useable rpm range.

[955.0]

I'd like to take the time to explain how the exhaust side of an engine mimics a bell curve. Using the exhaust as a tuning tool becomes necessary when trying to extract the maximum power from a combo. For example it is possible to lose power from underscavenging the cylinder head chamber and a loss of power could also be had from overscavenging. When over-lap occurs (intake and exhaust valve open) the exhaust system needs to be sucking the spent gases from the chamber and start the intake charge coming into the chamber. If you have a *header* that produces an over-scavenging affect it will pull too much of the intake charge out of the chamber OR if the *header* does not have enough airflow (underscavenging) the residual gases will remain in the chamber. This is where potential power losses could occur. Now not only does the header affect the bell curve. The exhaust valve diameter, exhaust port size, exhaust port shape, and cam duration/ lift will also affect the bell curve.

Getting back to what was stated previously. With a properly chosen exhaust system and taking into consideration the theory above a 1 5/8" long tube header will pick up power across the entire rpm band over a shorty style 1 5/8” header on a stock long blocked application. I have had the opportunity to view shorty vs. longtube 1 5/8” header dyno tests on stock long blocked efi 302’s. From where the test started around (2,000 rpm) to the cut off point (5,500 rpm) the avg. power increased with the longtubes.

To illustrate how easily one can over shoot or under shoot on header size I will be assessing three different sizes of longtube headers on a chassis dyno in the future to determine what size fits my application i.e., produces the most avg. power in the useable rpm range.

I thank you for all the valuable information, As I sit here today my engine is stock, you said the long tube headers would make more power on a stock engine. This winter I was going to get a Trickflow top end do you think The long tube headers would make more power with the trickflow setup? One more thing Now I'm running a BBK off road H pipe I'll need a different mid pipe do you think I would be better off with the H or the X. Thank you

[Pure Stock]

I thank you for all the valuable information, As I sit here today my engine is stock, you said the long tube headers would make more power on a stock engine. This winter I was going to get a Trickflow top end do you think The long tube headers would make more power with the trickflow setup? One more thing Now I'm running a BBK off road H pipe I'll need a different mid pipe do you think I would be better off with the H or the X. Thank you

A couple of questions first off:

1. Primary useage of 5.0L (street, street and strip, track only)
2. Will an increase in c.i.d. be in the near future or will you retain the stock short block?
3. Any power/E.T./MPH goals?
4. Will there be a power adder introduced into the combo anytime soon?

[955.0]

A couple of questions first off:

1. Primary useage of 5.0L (street, street and strip, track only)
2. Will an increase in c.i.d. be in the near future or will you retain the stock short block?
3. Any power/E.T./MPH goals?
4. Will there be a power adder introduced into the combo anytime soon?

It's my summer car so I would say Street strip

I'm planning on keeping the stock block.

No certain goals, but time will tell.

Probally a supercharger but not untill next winter.

Thank you for all your help.