Difference between 1-3/4" & 1-7/8" headers.
#436386
08/13/09 12:39 AM
08/13/09 12:39 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Motor will be a 451" low-deck BB. Solid flat tappet cam @ 252*. 10.5:1. Stealth heads.
How much of a difference would there be between 1-3/4" primary tube and 1-7.8" primary tube headers??
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: 64Post]
#436391
08/13/09 10:56 AM
08/13/09 10:56 AM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
You'll kick yourself if you don't go with 2" headers. DAMHIK...
That's not a 2" header combination.
Assuming the two headers are otherwise the same (i.e. no design flaws on one that aren't on the other), the 1 7/8" are probably worth 10+ HP over the 1 3/4".
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: BradH]
#436392
08/13/09 11:59 AM
08/13/09 11:59 AM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
You'll kick yourself if you don't go with 2" headers. DAMHIK...
That's not a 2" header combination.
Maybe not, but what if he adds upgrades later on? Ported heads? More cam? More intake? I spent $800 for 1 3/4" TTIs for the first iteration of my motor. I now have a bigger solid and ported MCH Eddys. Now, I've got to spend another $900 to get the optimal headers for my combo. 2" headers give you room to grow.
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: 64Post]
#436393
08/13/09 12:19 PM
08/13/09 12:19 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Quote:
Quote:
You'll kick yourself if you don't go with 2" headers. DAMHIK...
That's not a 2" header combination.
Maybe not, but... 2" headers give you room to grow.
Better to plan ahead better and buy the right headers the first time.
FWIW, I've gone 12.2s w/ 1.75" headers, 11.0s w/ 1.875" and 10.5s w/2.0". I'm pretty sure my header sizing was a good fit for the respective combination, so I don't see the need for a 2" header in what's been described above.
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: BradH]
#436394
08/14/09 01:35 AM
08/14/09 01:35 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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OP
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Posts: 4,319
Puyallup, WA
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It is primarily a street car that sees 4 or 5 trips to the strip a year. I'm leaning towards a new set of 1-3/4" for a few of reasons. A) going to be using a Proform bodied 750 Holley (825 cfm) to keep it nice & tunable for street use (and I already have it), 1-3/4" headers may lend themselves to this carb (???). B) cost. Summits headers have a 5/16" flange, and are easy on the wallet. C) Rons Red 63 goes faster than my goal with less motor, and uses 1-3/4" headers.
I know the larger tubes will make more power up top, but truth is, I sorta don't want the car to go faster than 11.50, because I don't want to have to put a roll-bar in it. (although I'm no different than all you guys, too fast wouldn't be the worst problem I've had!)
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: 383man]
#436396
08/14/09 08:05 AM
08/14/09 08:05 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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for the price, I don't think the hedman elites can be beat. IIRC the tubes don't go under the steering like other cheapies, or am I mistaken about that ron?
I just wish they made a small block version.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: patrick]
#436397
08/14/09 12:03 PM
08/14/09 12:03 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
master
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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The headers on the 383 in the car right now are older headmans, and the tube bend shape looks just like Rons picture on the driver side. The pictures shown of the Summit headers also look to be this exact same bend sequence, which does stay above the steering, and fits very nicely.
The reason I'm ditching the ones on the car currently is that the flanges, which are 3 seperate pieces, are warped at the center ports. They're doing okay right now with Remflex gaskets, but they have been a problem in the past, and its time to jettison them.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: patrick]
#436398
08/14/09 02:05 PM
08/14/09 02:05 PM
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Joined: Nov 2006
Posts: 1,458
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,458
oklahoma
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Quote:
for the price, I don't think the hedman elites can be beat. IIRC the tubes don't go under the steering like other cheapies, or am I mistaken about that ron?
I just wish they made a small block version.
I dont think any of the cheap big block headers go under under the steering, thank goodness, the small block ones are a drag 
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: 383man]
#436399
08/14/09 08:00 PM
08/14/09 08:00 PM
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Joined: May 2004
Posts: 1,031
South Jersey
kruger
Yours Too!
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Yours Too!
Joined: May 2004
Posts: 1,031
South Jersey
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Quote:
Yes you are right as I use the Hedman Elite 1-3/4 tube headers. 11.50's so far but I think it has at least 11.40's in it. My headers came with the car as my buddy who sold me the car had bought them and never installed them so they were brand new and never installed when I got the car. They dont seem to hurt my mild combo and and they might even help the low end as I sixty better then my sons Dart does and he has 2" tubes on his. You should be fine for a mild street/strip car with the 1-3/4 tubes. Ron
 
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Re: Difference between 1-3/4" & 1-7/8" headers.
[Re: StealthWedge67]
#436400
08/14/09 08:53 PM
08/14/09 08:53 PM
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Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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Quote:
Motor will be a 451" low-deck BB. Solid flat tappet cam @ 252*. 10.5:1. Stealth heads.
Sounds just like mine except I have mildly ported 516's with 2.08/1.74 valves, so I will not have enough high end to even need 1 7/8" until I can afford some decent heads!
My combo is a low-buck effort so I am using 1 3/4" Hedman B-body headers in my '72 Dart (in fact I bought the set that was used in the tech pics on BBD). Today I found that #6 tube needs another small dimple to clear the Lakewood housing - the previous owner's car didn't have one 
If I ever get it in the car I will let you know how it works! Guess the big question is, do you want to buy headers twice...
-Charles
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