1 3/4 or 1 7/8 kooks headers for ls3 ???
01-05-2010, 01:35 PM
#21
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..
01-05-2010, 02:25 PM
#22
Melting Slicks
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.
01-06-2010, 08:55 PM
#25
Team Owner
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!
01-06-2010, 09:20 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.
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.
01-06-2010, 09:39 PM
#28
Melting Slicks
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.
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.
01-07-2010, 07:23 AM
#30
Team Owner
01-07-2010, 07:24 AM
#31
Team Owner
01-07-2010, 12:11 PM
#32
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..
01-07-2010, 12:13 PM
#33
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..
01-07-2010, 05:01 PM
#34
Former Vendor
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!
05-21-2018, 01:07 AM
#35
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?
05-21-2018, 01:09 PM
#36
Le Mans Master
The LS3 head design always does better with the 1 7/8" headers. In fact 2" is even better.
05-21-2018, 03:45 PM
#37
Racer
05-21-2018, 03:47 PM
#38
05-21-2018, 03:53 PM
#39
Racer
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
05-21-2018, 04:49 PM
#40
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