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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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Joined: Mar 2010
Posts: 64 MA
Kevin Kowalski
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member
Joined: Mar 2010
Posts: 64
MA
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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.
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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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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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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"
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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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Joined: Jan 2008
Posts: 2,592 None
71rm23
master
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master
Joined: Jan 2008
Posts: 2,592
None
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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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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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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. 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.
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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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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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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"
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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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Joined: Jan 2003
Posts: 9,872 Weddington, N.C.
Streetwize
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master
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
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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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