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1 3/4 or 1 7/8 kooks headers for ls3 ???

 
Old 01-05-2010, 02:35 PM
  #21  
nwc6
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Originally Posted by Rock'n Blue 08 View Post
Why would you think there is 10 pounds difference. Sounded silly to me!
The pipes wall thickness is the same, 1 3/4 or 17/8..Maybe 1-2 lbs for the whole system. Maybe a vendor will step in with weights of both systems..
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Old 01-05-2010, 03:25 PM
  #22  
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I had to make some assumptions of lengths as I don't have any headers to measure from but using 2 1/2' x 8 for the headers and 5' x 2 for the X pipe it calculates right at 6 pounds difference. And if you really want to get close you have to add the difference in flange and clamp sizes too. So 6 pounds added to the about 9 pound difference in stock vs. 1 7/8 equates to a 15 pounds savings going from stock to 1 3/4 with 2 1/2 mid and X piping.
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Old 01-05-2010, 05:37 PM
  #23  
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seems that 1 7/8 is my choice for the ls3 ..

with only cai and cat back 3 in will be a wrong choice???
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Old 01-05-2010, 05:52 PM
  #24  
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What about stock LS7 exh. manifolds for an otherwise stock, bolt-on, or cam only LS3?
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Old 01-06-2010, 09:55 PM
  #25  
3 Z06ZR1
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Originally Posted by 8850 View Post
I had to make some assumptions of lengths as I don't have any headers to measure from but using 2 1/2' x 8 for the headers and 5' x 2 for the X pipe it calculates right at 6 pounds difference. And if you really want to get close you have to add the difference in flange and clamp sizes too. So 6 pounds added to the about 9 pound difference in stock vs. 1 7/8 equates to a 15 pounds savings going from stock to 1 3/4 with 2 1/2 mid and X piping.
Lots of assumptions. More like MAKE it up as you go!
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Old 01-06-2010, 10:12 PM
  #26  
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Old 01-06-2010, 10:20 PM
  #27  
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Hell while your at lets talk collector length for torque and horsepower but I sure as hell wouldn;t put Kooks headers on anything I own. Last 2 pairs fit like a square peg in a round hole. Good luck with them.
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Old 01-06-2010, 10:39 PM
  #28  
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Originally Posted by 8850
I had to make some assumptions of lengths as I don't have any headers to measure from but using 2 1/2' x 8 for the headers and 5' x 2 for the X pipe it calculates right at 6 pounds difference. And if you really want to get close you have to add the difference in flange and clamp sizes too. So 6 pounds added to the about 9 pound difference in stock vs. 1 7/8 equates to a 15 pounds savings going from stock to 1 3/4 with 2 1/2 mid and X piping.
Originally Posted by Rock'n Blue 08 View Post
Lots of assumptions. More like MAKE it up as you go!
I give some accurate good information using a few assumptions to help out our weight conscious racers. Then a sarcastic post like this appears. What was the purpose of his sarcasm? What is a person thinking that becomes obnoxious for no reason?
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Old 01-06-2010, 10:51 PM
  #29  
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Originally Posted by 8850 View Post
I give some accurate good information using a few assumptions to help out our weight conscious racers. Then a sarcastic post like this appears. What was the purpose of his sarcasm? What is a person thinking that becomes obnoxious for no reason?
There are some here you just learn to ignore.

San
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Old 01-07-2010, 08:23 AM
  #30  
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Originally Posted by nwc6 View Post
The pipes wall thickness is the same, 1 3/4 or 17/8..Maybe 1-2 lbs for the whole system. Maybe a vendor will step in with weights of both systems..
end of story!
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Old 01-07-2010, 08:24 AM
  #31  
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Originally Posted by oldmansan View Post
There are some here you just learn to ignore.

San
Funny thats what people think of you!
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Old 01-07-2010, 01:11 PM
  #32  
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the guy has a CAI and wants headers and nothing else.. 10lbs will do nothing at all as far as performance with this setup. 10lbs did seemed to be pulled out fo the air.. not shocked by the response to that..
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Old 01-07-2010, 01:13 PM
  #33  
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OP, get the 1 7\8's with 3' pipes.. it will not hurt you in anyway right now but you will benefit later from it if for some reason you change your mind and want to put more power to it..
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Old 01-07-2010, 06:01 PM
  #34  
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There is more variance between two dyno runs than there is the two header sizes. I typically prefer 1 7/8" on an LS3. I like having room to grow. As you guys know, we have several sales on Kooks. If your interested, call us @ 443-730-9428. Thanks!
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Old 05-21-2018, 02:07 AM
  #35  
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most seem to agree that there is a hp level at which you pretty much want to be running the bigger pipe. At 500whp with a H/C setup on an ls3, with zero plans to go fi in the future, how does the 1 3/4 look compared to the 1 7/8? Anyone running this setup on a head cam car because they think it's superior?
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Old 05-21-2018, 02:09 PM
  #36  
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The LS3 head design always does better with the 1 7/8" headers. In fact 2" is even better.
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Old 05-21-2018, 04:45 PM
  #37  
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Originally Posted by Suns_PSD View Post
The LS3 head design always does better with the 1 7/8" headers. In fact 2" is even better.
I don't know anything about 2" exhaust........but I'd go with a 1 7/8" header every time over a 1 3/4" header.

Jus' sayin'.....

KW
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Old 05-21-2018, 04:47 PM
  #38  
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Originally Posted by KW Baraka View Post
I don't know anything about 2" exhaust........but I'd go with a 1 7/8" header every time over a 1 3/4" header.

Jus' sayin'.....

KW
if you ehded up with a solid set of 1.75s do you think itd be worth the hassle to swap? It would also probably hurt my timeline
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Old 05-21-2018, 04:53 PM
  #39  
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Originally Posted by Bigwebb View Post


if you ehded up with a solid set of 1.75s do you think itd be worth the hassle to swap? It would also probably hurt my timeline
It's like I said in the other thread.....if you have the 1 3/4" headers.....use them.

Sure.....you'd gain a bit with the 1 7/8" pipes, but at some point you just gotta forge forward with what you have!

If you keep overthinking and dicking around with your project, you'll NEVER get it done!

KW
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Old 05-21-2018, 05:49 PM
  #40  
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No reason to go with either size....2" has been shown to make more power everywhere even on a bone stock ls3. why would you leave power on the table if youre starting out fresh with a new setup
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