Quote:

---

A common misconception is that headers only influence the top end.
Another common misconception is that headers only reduce power by reducing restrictions in the exhaust system.

Dyno tests have shown that shorty headers make more power than manifolds and long tube headers make more power than shorties. It has to do with the length of time the exhaust pulse travels in its own tube. A good long tube header will not only increase power above the torque peak, but it also increases torque below the torque peak. This low rpm increase clearly has little to do with flow restriction.

The oldsmobile head is an example. The center two exhaust ports are run together in the head and come out as one wider port which should lower restriction for those two ports. However, it is always advantageous to divide the ports. There is significant cross-talk between the two which interrupts something, probably scavenging during overlap. Flathead fords also had the center two exhast ports run together. In the flathead crowd it was a well-known modification to run a piece of sheet metal up that center port to divide the sides and increase performance.

There's more to an exhaust system than restriction.

R.

---

I am aware of all that, yet my observations are still correct. I presume that you meant to say "increase power by reducing restrictions". Restriction isn't the ONLY part of the equation.....but it is the most important part, esp. when comparing relatively restrictive stock exhaust systems.



Dave

Quote:

---

Whatever.

http://www.moparmusclemagazine.com/techarticles/mopp_0106_manifolds_vs_headers/viewall.html

R.

---

Read it all before.

- 1) Nobody said the headers wont make more power (all other things being equal)

- 2) How much power the headers are likely to add depends on the build and more importantly the cam. There is no way (for example) that headers would make that kind of difference on MY motor because MY cam is designed to make the HP manifolds work.

- 3) that test doesn't take into account the rest of the exhaust system. I've seen a good quality exh system and mufflers make almost .5 seconds difference. How many hp do you suppose that equates to?

......bottom line (as I said) isn't that headers make more power but rather that it has been proven that you can build a HP manifold equipped motor to equal that power level if that's your goal. As I said in my original post, it depends on your perspective.

Dave

Quote:

---

A manifold engine is like a one legged man in an a** kicking contest.
You can do whatever you want, but having two legs is always better.

---

just don't make the mistake of lining up against some of the manifold equipped cars in F.A.S.T. or it will be your a**


Dave

Quote:

---

Whats even scarier is a fast car with real headers.

---

Yeah, you're right; a 383 with headers is the shiznit!

Dave

Quote:

---

Quote:

---

Whats even scarier is a f.a.s.t car with real headers.

---

Yeah, you're right; a 383 with headers is the shiznit!

Dave

---

Sorry wasn't talking about my car. Reread the quote.

fastest I've gone with my motor is 130 ,, so I'm hardly in the same ranks

Quote:

---

Quote:

---

Quote:

---

Whats even scarier is a f.a.s.t car with real headers.

---

Yeah, you're right; a 383 with headers is the shiznit!

Dave

---

Sorry wasn't talking about my car. Reread the quote.

fastest I've gone with my motor is 130 ,, so I'm hardly in the same ranks

---

I did reread your quote; you changed it from "fast" to "f.a.s.t." which changes the meaning......and of course there AREN'T any F.A.S.T. cars with headers......against the rules and all that.

anyway, have a good day.


Dave

Quote:

---

Quote:

---

Quote:

---

Quote:

---

Whats even scarier is a f.a.s.t car with real headers.

---

Yeah, you're right; a 383 with headers is the shiznit!

Dave

---

Sorry wasn't talking about my car. Reread the quote.

fastest I've gone with my motor is 130 ,, so I'm hardly in the same ranks

---

I did reread your quote; you changed it from "fast" to "f.a.s.t." which changes the meaning......and of course there AREN'T any F.A.S.T. cars with headers......against the rules and all that.

anyway, have a good day.


Dave

---

Well I agree, when you have lemons, you make lemonade.
Here's to hoping your day is as good as mine

Quote:

---

Here's to hoping your day is as good as mine

---

Thanks!

Where in Sask. do you live?; I was just in Regina and Moosejaw for meetings and to visit some friends not too long ago......nice place.

Dave