1 3/4" Headers vs. 1 7/8"
Thread Starter
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Joined: May 2007
Posts: 91
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From: Bakersfield CA
1 3/4" Headers vs. 1 7/8"
How do I know which is best for my application?? The car is bone stock now.. will be FI later. I'm interested in doing headers first but I'm unsure about which size to go for.
Former Vendor
Joined: Jul 2006
Posts: 701
Likes: 0
From: Tempe AZ
Most of the time you see it like this:
Up to 500 Hp: 1 3/4
500+ you want 1 7/8ths
Id go with Kooks or LG's personally, Also it depends what supercharger you go with too. If you go maggie 1 3/4's is what I would choose if you go ATI Id go 1 7/8s for increased flow, I would think about ceramic coating too.
Up to 500 Hp: 1 3/4
500+ you want 1 7/8ths
Id go with Kooks or LG's personally, Also it depends what supercharger you go with too. If you go maggie 1 3/4's is what I would choose if you go ATI Id go 1 7/8s for increased flow, I would think about ceramic coating too.
Former Vendor
Joined: Jul 2006
Posts: 701
Likes: 0
From: Tempe AZ
At the wheels, crank would happen pretty quick most of the cars we do here go with the 1 3/4's. They usually stick with smaller cam, intake, and exhaust max or just bolt a maggie on. The cars that we do rowdy cams, heads, intake, or go superchargers with blower cam ect will go 1 7/8ths and see good gains. I would say for you if you are thinking about going "big" with your mods do the 1 7/8ths.
Pro
Joined: Sep 2004
Posts: 624
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From: Bakersfield Ca.
Header Size
Unless you're running slicks at the drags the little loss of low end torque is ownely noticed by the slightly less smoke pouring from the rear tires. I'd go with the 1 17/8", they're the same price and then you already have the best if you choose to go with heavy mods later.
Last edited by blown34; May 29, 2007 at 05:55 PM. Reason: Spelling error
Safety Car
Joined: Jun 2004
Posts: 4,430
Likes: 81
From: Whidbey Island WA
I dont even buy the low end loss thing that people claim. When I had my 1 7/8 ARHs tuned the tuner pulled up a number of runs from other stock cars and the curve is pretty much the same. A good example would be LGs which were installed the day before with the dyno runs occuring in almost the same air. My car made more power all the way and the curve was esentially the same. The big cubes/big tubes, small cubes/small tubes thing doesnt appear to work with the LS2. It seems to be able to support the larger tubes just fine. My take, get the bigger tubes. More headroom and your not going to lose anything.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
1 7/8 is the only way to go. You will lose nothing now, but gain later if you decide to mod a whole lot.
Before you ask which headers are the best, I had both Kooks and LG's. The LG's had better dyno numbers but the Kooks had better track numbers. You choose which one you prefer.
Before you ask which headers are the best, I had both Kooks and LG's. The LG's had better dyno numbers but the Kooks had better track numbers. You choose which one you prefer.
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Team Owner
Joined: Jan 2004
Posts: 38,772
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From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
1 7/8 is the only way to go. You will lose nothing now, but gain later if you decide to mod a whole lot.
Before you ask which headers are the best, I had both Kooks and LG's. The LG's had better dyno numbers but the Kooks had better track numbers. You choose which one you prefer.
Before you ask which headers are the best, I had both Kooks and LG's. The LG's had better dyno numbers but the Kooks had better track numbers. You choose which one you prefer.
love my kooks 1 7/8
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
The "low end loss" seems to come up a couple of times a year. There is no low end loss. Both 1.75" and 1.875" headers gain HP & TQ. The gains are sometimes higher on the RPM scale with the 1.875" and sometimes lower with the 1.75".
If I want to add HP/TQ I want as much as I can get at the RPM's that I drive and I don't drive much at 2500 RPM to 3000 RPM.
1.875" Dynatech Supermaxx w/cats & X pipe here and completely satisfied.
If I want to add HP/TQ I want as much as I can get at the RPM's that I drive and I don't drive much at 2500 RPM to 3000 RPM.
1.875" Dynatech Supermaxx w/cats & X pipe here and completely satisfied.
Last edited by haljensen; May 30, 2007 at 09:51 AM.
