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Re: Headers vs HP Manifold
[Re: DPelletier]
#1106868
11/07/11 05:40 PM
11/07/11 05:40 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
Ron I didn't belive it either until I read t he Car Craft artical that somebody posted here. As a matter of fact I think it was 39. I don't have the link but I'm sure it can be googled w/o much effort.
39 on one particular motor; sure. The reality is that you could gain anywhere between nothing and 100hp: it depends on the build.
It really isn't rocket science; the amount of power gained by switching to tube headers from manifolds depends on a number of things;
- the manifolds in question. Our HP manifolds are decent - better than GM BB manifolds and worse than Hemi or MW manifolds.
- where the other bottlenecks are; there isn't as much point in increasing exhaust flow on a motor that has a crappy flowing intake, heads, etc.
The best example of a motor that needs headers that I can think of is a 427 L88 BBC which due to it's restrictive factory manifolds, good flowing heads and a radical solid lifter cam can gain somewhere around 80 - 100hp with the swap. My guess is a stock street hemi or Max Wedge falls on the other side of the spectrum; the stock manifolds flow much better than their GM counterparts. An RB with HP manifolds falls somewhere in between......depending on how it's built. I would guess that a bone stock 375hp 440 Magnum would see a slight increase along the lines of 10-20hp......is that worth it? that depends on how you weigh the pros and cons; there is no right or wrong answer.
 +
Dave
Actually I may have misled some as I thought Mr Yuck meant 39 hp going from 1-3/4 headers to 2" headers not from manifolds. And he may well be right as it just seemed like alot for the header upgrade. Sorry if I misled anyone. Ron
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Re: Headers vs HP Manifold
[Re: DPelletier]
#1106870
11/07/11 08:40 PM
11/07/11 08:40 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Actually I may have misled some as I thought Mr Yuck meant 39 hp going from 1-3/4 headers to 2" headers not from manifolds. And he may well be right as it just seemed like alot for the header upgrade. Sorry if I misled anyone. Ron
Perhaps not; rereading the posts, maybe you were right and they meant 39hp between 1 3/4" and 2" headers.  All I know is that is way more that I would think is possible on a stockish/street style 400 -450hp build. On a 500-600hp motor, maybe.
Dave
it was header vs header. and it was here maybe a week ago. I'll see if I can find it.
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