Re: 1 3/4 or 1 7/8 header ????
[Re: 451Mopar]
#2185797
10/30/16 01:18 PM
10/30/16 01:18 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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Who makes the 1-3/4" headers? All I usually see are 1-7/8 or 2"? Summit has a set for $120? I had them on my tired 440 which ran 12.0's at 113 mph a few weeks ago in my GTX. They fit great!
"I think its got a hemi"
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Re: 1 3/4 or 1 7/8 header ????
[Re: AndyF]
#2185798
10/30/16 01:19 PM
10/30/16 01:19 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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My pump gas 470 makes 700 hp with 2 inch headers on the dyno. I tried a set of 1 3/4 headers to see what would happen and it still made 690 hp. Ouch! I just upgraded from 1 3/4 to 1 7/8 to make a touch more power. Wanted ceramic coated anyways! lol!
"I think its got a hemi"
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Re: 1 3/4 or 1 7/8 header ????
[Re: gdonovan]
#2185851
10/30/16 02:32 PM
10/30/16 02:32 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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with header fitment being the pain that it is, that would be far more important & I would get a set that fits the best (which wont be the 2") whether it be 1&3/4 or 1&7/8
live every 24 hour block of time like it's your last day on earth
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Re: 1 3/4 or 1 7/8 header ????
[Re: fast414]
#2185870
10/30/16 02:54 PM
10/30/16 02:54 PM
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Joined: Oct 2015
Posts: 732 Michigan
BlueRacer69
super stock
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super stock
Joined: Oct 2015
Posts: 732
Michigan
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Like Robert said, fitment plays a big part in your choosing the size. With that said, I think tti makes a 1 3/4 size header or they use to. Of course they will cost a lot more then Summit's price of $120.00.
Last edited by BlueRacer69; 10/30/16 03:22 PM.
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Re: 1 3/4 or 1 7/8 header ????
[Re: 383man]
#2188593
11/03/16 10:23 AM
11/03/16 10:23 AM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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At 440" and a .557 the 1 3/4" will be fine but IMO it's important to remember the collector size will tend to limit the RPM that peak torque will be produced, so if the collector is too small for the compression and cam it will lower the HP trajectory (rate of HP rise per 100 rpm) beyond the peak torque RPM. It's pretty easy to adapt and weld a larger slip on collector (such as the ones sold by Shoenfeld) to inexpensive headers, Generally, a 3 1/2" collector will likely pick up your HP compared to a 3" even with the same primary tube sizes, all else being equal. That is provided/assuming you will also have a low restriction system downstream of it. ET improvements can be found when the converter, cam and collector size are optimally tuned for one another.
Last edited by Streetwize; 11/03/16 10:27 AM.
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