Headers question
Safety Car
Joined: Apr 2005
Posts: 4,769
Likes: 0
From: SFV CA
It all comes down to how much air your pushing thru the motor. Again this is oversimplified so pls nobody flame me. On a NA 364 you can only move as much air as the motor breathes in. Under these circumstances 1 3/4 is more than adequate(did not take into account custom intakes and extreme high horsepower situations). When going to a blower/nitrous/larger cubes you are bringing in more air and most are going with a cam with duration leaning heavily to the exhaust side to move that air out. This is were we begin to see the advantages of a 1 7/8 or larger exhaust. Hope this helps. Please rebuke me if i'm wrong
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Previous post is accurate. The 1-7/8" headers will flow better, but velocity is lower than with a smaller tube. The result is better high RPM performance, but at the expense of low-RPM & mid-range performance. Heads & cam and/or power adder (blower or nitrous) cars benefit more from the higher flow. Bolt-on and mildly modded cars don't benefit as much.
There are similar considerations with regard to the tube length. LG headers have longer tubes, and as a result, produce great TQ numbers.
Bottom line is that there really isn't that great a difference between most of the better headers. For the typical enthusiast who only races occasionally, you'd be better to make your selection based on price, fit, and finish.
There are similar considerations with regard to the tube length. LG headers have longer tubes, and as a result, produce great TQ numbers.
Bottom line is that there really isn't that great a difference between most of the better headers. For the typical enthusiast who only races occasionally, you'd be better to make your selection based on price, fit, and finish.
Melting Slicks
Joined: Mar 2006
Posts: 2,064
Likes: 4
Last two posts are 100% accurate. Call Andy at andacorvette.com. He'll set you straight. I went with American racing at 1 3/4. No plans to supercharge the motor (yet) so 1 3/4 was the choice.
BTW, lots of complaints out there about LG's on the c6, fit and missing parts.......lots of happy stories from American Racing. They are a little behind production cause of demand, call Andy, he most likely will have them in stock.
BTW, lots of complaints out there about LG's on the c6, fit and missing parts.......lots of happy stories from American Racing. They are a little behind production cause of demand, call Andy, he most likely will have them in stock.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
...bottom line...smaller ones make better dyno numbers, the larger ones make you go faster....Immeasurably faster unless you race regularly. Buy the larger ones and get the best of both worlds.
Drifting
Joined: Feb 2006
Posts: 1,523
Likes: 75
From: Winter Garden, Florida
06corvette, I don't mean to hijack your thread, but if you will permit me to inquire of this comment...
I had decided on 1 3/4" with the desire for future bolt-ons, and maybe heads and cam. I visited a tuner in Northern CA who adamantly steered me away from LG's (which until then I had finally settled on and was ready to install. Instead, he recommended Kooks, Dynatech or Bassani. Thus I put myself on hold again). He said the LG's were prone to leaks from poor build quality. Is this one such issue you are referring to? If so, I've somehow managed to miss them. Thanks.
Again, 06corvette, apologize for the slight tangent. Just after the best header (as many as there may be)
Originally Posted by LOS ANGELES PI
BTW, lots of complaints out there about LG's on the c6, fit and missing parts.......lots of happy stories from American Racing. They are a little behind production cause of demand, call Andy, he most likely will have them in stock.
Again, 06corvette, apologize for the slight tangent. Just after the best header (as many as there may be)
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Team Owner
Joined: Dec 2003
Posts: 57,401
Likes: 162
From: queensbury ny
headers...
well,this thread kind of answered some of my questions too!!!I would like to know if just headers(with no hi-flow aftermarket cats,just stock ones) is ok for the c6 since I hear the c6 cats are higher flow than the c5's were.
Drifting
Joined: Feb 2006
Posts: 1,523
Likes: 75
From: Winter Garden, Florida
Originally Posted by jesse12804
well,this thread kind of answered some of my questions too!!!I would like to know if just headers(with no hi-flow aftermarket cats,just stock ones) is ok for the c6 since I hear the c6 cats are higher flow than the c5's were.
Team Owner
Joined: Jan 2004
Posts: 38,769
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by vetteuphoria
Just passing along what the vette tuner in Northern CA told me: He said to keep the stock cats. That way it will pass the sniffer test. It will also pass the visual except for the headers, but some may look the other way given that it passes the sniffer anyway. He told me that high flow cats will neither pass the visual nor the sniffer. In addition, he said h/f cats only add a couple of hps and are not really worth the money unless you're straining for every ounce of hp with no where else to look. Again, this is only what I was told. I have no actual experience in this area (yet), but they do tune alot of vettes.
The stock cats are located right off the stock headders and are large
When you put long tubes on the cats have to go UNDER the car
Drifting
Joined: Feb 2006
Posts: 1,523
Likes: 75
From: Winter Garden, Florida
Originally Posted by burtonbl103
The stock cats are located right off the stock headders and are large
When you put long tubes on the cats have to go UNDER the car
When you put long tubes on the cats have to go UNDER the car
Instructor
Joined: May 2006
Posts: 186
Likes: 1
From: Ballwin MO
Originally Posted by CYA-Vett
...bottom line...smaller ones make better dyno numbers, the larger ones make you go faster....Immeasurably faster unless you race regularly. Buy the larger ones and get the best of both worlds.
Team Owner
Joined: Jan 2004
Posts: 38,769
Likes: 621
From: Boston MA
St. Jude Donor '06-'07-'08,'12-'13
Originally Posted by vetteuphoria
Come to think of it, YOU'RE RIGHT. I suppose he meant to cut and reposition. What other option would there be to be able to keep stock cats?
But the gain is alot lower like 10hp
So it is cost prohibitive
unless you live in CA and want to pass emmisions and CARB
Race Director
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
Originally Posted by CYA-Vett
...bottom line...smaller ones make better dyno numbers, the larger ones make you go faster....Immeasurably faster unless you race regularly. Buy the larger ones and get the best of both worlds.
Tuners will tell a different story. Depends on engine mods. Each has there advantages.
