Verifying a header's primary diameter
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Verifying a header's primary diameter Hey guys, a couple of months ago i bought a beautiful used set of what i was told were Kooks 1 3/4" race style LT's (non stepped).
The passenger side install was a breeze and the driver side was a real bitch. (I had thought that Kook's design was to be real easy on both sides...and this wasn't my first set of headers to install, either)
Last night a few of the guys and i were talking at Bob's big boy and joked that maybe the headers were tougher to get in since the primaries were bigger. (the difference from 1 3/4" to 1 7/8th's isn't too drastic so I doubted it)
Then one guy (hitmanws7) looked on Kook's website and said kooks didn't make a 1 3/4 "race style' (no AIR provisions). We then went and looked at our cars. I think they looked similar to my friends 1 3/4" Hookers, but he swears mine look bigger. This all sparked the debate....how do we measure the diameter of a primary? Is it the I.D. of the primary or the O.D.?
I figured I could wrap a shoe lace around the primary, mark it and then measure it for the size, but I dont know what the O.D. should be.
Anyone out there got an idea? Maybe some sponsers who sell them?
Thanks for any help.
The passenger side install was a breeze and the driver side was a real bitch. (I had thought that Kook's design was to be real easy on both sides...and this wasn't my first set of headers to install, either)
Last night a few of the guys and i were talking at Bob's big boy and joked that maybe the headers were tougher to get in since the primaries were bigger. (the difference from 1 3/4" to 1 7/8th's isn't too drastic so I doubted it)
Then one guy (hitmanws7) looked on Kook's website and said kooks didn't make a 1 3/4 "race style' (no AIR provisions). We then went and looked at our cars. I think they looked similar to my friends 1 3/4" Hookers, but he swears mine look bigger. This all sparked the debate....how do we measure the diameter of a primary? Is it the I.D. of the primary or the O.D.?
I figured I could wrap a shoe lace around the primary, mark it and then measure it for the size, but I dont know what the O.D. should be.
Anyone out there got an idea? Maybe some sponsers who sell them?
Thanks for any help.
Last edited by Sommer86; Dec 19, 2009 at 09:08 PM.
x2^^^ inside diameter. Different vendors use diffferent size tubing thickness so i doubt you can figure it out that way.. I know how... remove the DRIVER side header and check the inside diameter..lol!
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
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x2^^^ inside diameter. Different vendors use diffferent size tubing thickness so i doubt you can figure it out that way.. I know how... remove the DRIVER side header and check the inside diameter..lol!
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
) to get it in from the bottom if they were even a hair larger. Thread Starter
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x2^^^ inside diameter. Different vendors use diffferent size tubing thickness so i doubt you can figure it out that way.. I know how... remove the DRIVER side header and check the inside diameter..lol!
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
Jk... I had problems installing my kooks but after they slipped in they had great overall clearance and mine are 1 7/8.
I believe that larger header diameter headers would be harder to install, atleast in my z06. These 1 3/4 ARHs were an extremely tight fit on the driver side from the top. Would have had to jack the car up higher ( no lift ) to get it in from the bottom if they were even a hair larger.
) to get it in from the bottom if they were even a hair larger.
Mine wouldn't go in from the top... but close. They had to go in from the bottom. We had to disconnect the steering knuckle, bang the firewall, and the heat shield, remove the oil filter, and notch the K.....all for a set of friggin headers. And now I'm gonna be pissed if I've got 1 7/8th, lol.
https://ls1tech.com/forums/11596564-post4.html
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I should really put this somewhere that people can easily find it
https://ls1tech.com/forums/11596564-post4.html
https://ls1tech.com/forums/11596564-post4.html
What can I do to sweet talk you into measuring the O.D. of one of your primaries?
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Are your super comps stepped?
Mike I take what I told you back, apparently Kooks makes both a 1 3/4 and 1 7/8 Race header. I just checked their site. but to be sure have someone with 1 7/8 measure their diameter
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Weird. I looked on their site earlier but I didn't see anything about race style or non stepped with pictures for me to check mine against. Oh well. So who's got a set of Kook's 1-7/8's race style headers in the Los Angeles area I can look at?
I've always seen and measured header primaries by their outside diameter. I've verified this on pretty much every LSx header manufacturer including Kooks.
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NOPE, but the driver side was hader to put on than the passenger side i had to remove that little oil bypass/tube thingy on top of the oil filter to get the headers to go in ......
I've got the same headers, Kooks 1 3/4" race style no EGR no AIR. I measured mine before I put them on, inside to inside was 1 3/4". Maybe you could measure the circumference, mine were 5 9/16".
Also my driver side install was a Pain, I had to take off the oil filter and finagle the header around until it slipped in (from the bottom).
Also my driver side install was a Pain, I had to take off the oil filter and finagle the header around until it slipped in (from the bottom).
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I've got the same headers, Kooks 1 3/4" race style no EGR no AIR. I measured mine before I put them on, inside to inside was 1 3/4". Maybe you could measure the circumference, mine were 5 9/16".
Also my driver side install was a pain, I had to take off the oil filter and finagle the header around until it slipped in (from the bottom).
Also my driver side install was a pain, I had to take off the oil filter and finagle the header around until it slipped in (from the bottom).
On 1 3/4" that'd come to about 1.75", for 1 7/8" it's 1.875".
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
