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Re: Headers vs stock exhaust manifolds. Opinions? [Re: IMGTX] #2317676
06/07/17 03:22 PM
06/07/17 03:22 PM
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Kevin Kowalski Offline
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Originally Posted By IMGTX
Headers all the way.

There is something about the sound of headers that is just right for a musclecar. Stock Cast iron manifolds don't cut it and sound kinda boring and anemic.




I would argue that the rest of the exhaust system has more to do with the exhaust note than the minor difference between headers or cast iron manifolds. Usually most if not all of the exhaust system is changed when making a swap from exhaust manifolds to headers or vice versa so there's no apples to apples comparison.

The SuperCar and FAST cars running stock manifolds with free flowing exhaust systems sound anything but boring and anemic.

Re: Headers vs stock exhaust manifolds. Opinions? [Re: Kevin Kowalski] #2317715
06/07/17 04:34 PM
06/07/17 04:34 PM
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Quote:



I would argue



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Re: Headers vs stock exhaust manifolds. Opinions? [Re: MidPenMopar] #2317767
06/07/17 06:53 PM
06/07/17 06:53 PM
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They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Headers vs stock exhaust manifolds. Opinions? [Re: Supercuda] #2317773
06/07/17 07:16 PM
06/07/17 07:16 PM
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I went by an article on a 360 with headers and... it was utter garbage.

My mild 5.9 in my Duster with NO OTHER changes went from 14.2 to 13.49 out of the box and with jetting changes dropped to 13.0.

Manifolds vs headers - headers beat manifolds like a rented car.




"I think its got a hemi"
Re: Headers vs stock exhaust manifolds. Opinions? [Re: MidPenMopar] #2317775
06/07/17 07:26 PM
06/07/17 07:26 PM
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383man Offline
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In the last Mopar Muscle and Hemmings Muscle Machines they each did a stock type build and then added headers. The 340 in MM made 320 hp and with headers it made 352 hp. With the 6pk on it the eng made 356 hp and like 376 hp with headers.

Hemmings tested a 426 Hemi and made 494 hp and with headers it made 521 hp. As for me I will take the headers anyday. I have been running my TTI's for 6 years now with no leaks at all and never a burnt plug wire. I will take the headers as I like to race my car sometimes so why not go for the extra hp. Manifolds are fine if you dont plan to race or run a class where you have to run them. Ron

Re: Headers vs stock exhaust manifolds. Opinions? [Re: MidPenMopar] #2317786
06/07/17 08:00 PM
06/07/17 08:00 PM
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Re: Headers vs stock exhaust manifolds. Opinions? [Re: gdonovan] #2317891
06/08/17 12:00 AM
06/08/17 12:00 AM
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Originally Posted By gdonovan


I went by an article on a 360 with headers and... it was utter garbage.

My mild 5.9 in my Duster with NO OTHER changes went from 14.2 to 13.49 out of the box and with jetting changes dropped to 13.0.

Manifolds vs headers - headers beat manifolds like a rented car.



Did you read the article?

It basically says the same thing, but with dyno numbers


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Headers vs stock exhaust manifolds. Opinions? [Re: Supercuda] #2317960
06/08/17 06:43 AM
06/08/17 06:43 AM
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gdonovan Offline
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Originally Posted By Supercuda

Did you read the article?

It basically says the same thing, but with dyno numbers


Yup and the numbers are fairly low, I found the spread to be much wider.




"I think its got a hemi"
Re: Headers vs stock exhaust manifolds. Opinions? [Re: MidPenMopar] #2318012
06/08/17 11:08 AM
06/08/17 11:08 AM
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Northeast Indiana
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What a timely post, just last night I took manifolds off a Hemi and installed headers. That driver's side manifold looks incredibly restrictive. No comparison on ease of installation, but I believe the swap will be something akin to 'pulling a cork' out of the exhaust system.

The TTI headers with Schumacher mounts fit like a glove by the way.

Re: Headers vs stock exhaust manifolds. Opinions? [Re: 73DAD] #2318157
06/08/17 06:03 PM
06/08/17 06:03 PM
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I'll bet on a mild 383 you'll gain almost as much just by using 2 1/2" 440 head pipes (instead of 2 1/4" 383 pipes) as you would going to headers. 440's had H pipes which helped a bit too, you'll need to section an RB head pipe set to narrow it to use on a B motor.

Factory motors all had wide 114-ish lobe spreads which reduces overlap, generally the narrower the lobe separation (tighter, ie 106-110) angle the more headers help you. headers are also somewhat limited by the rest of the exhaust system too.

I had a basically stock 69 440 out of a Newport with ported closed chamber 67 "915 heads and a 484 purple shaft in a 73 duster with narrowed factory "Newport" logs on both sides. I realized on the Pass side I could fit a 68-71 Magnum Ram horn manifold so I did, The car picked up about 1 1/2 tenths (IN THE 1/8TH!) so maybe 2 1/2 in the 1/4? So it does help, but I'll bet if I ran the wider LSA 528 the gains would not have been as significant.

I've read that on small blocks a set of ported Magnums are about as good as Shorties and better than ported 340 manifolds

Last edited by Streetwize; 06/08/17 06:04 PM.

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