LG vs Kooks headers
My choice for a Z06 would be the 1 7/8" Kooks. It has a spike that I don't believe LG has. Not sure I like the merge collector on the LG altough some say it makes for more power. I would not put 1 3/4" on a 427 engine.
Either header requires some weld removal in the collector for optimum flow. I would clean inside either brand as well too before installing particularly if you are going to run cats.
Here's a thread with pics of both collectors: http://forums.corvetteforum.com/show...=Why+no+spikes
Either header requires some weld removal in the collector for optimum flow. I would clean inside either brand as well too before installing particularly if you are going to run cats.
Here's a thread with pics of both collectors: http://forums.corvetteforum.com/show...=Why+no+spikes
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From what I've been reading the LG's make more power for NA cars (3/4), while the kooks(7/8) help with power up top in FI cars. Also, the kooks seem to be the perfered choice for big cubed motors. But Im new and still researching, so I could be wrong.
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You are going to hear all different opinions from all kinds of different people on headers. I personally choose my LG pros for my 01 Z06 and have been happy with the quality and performance of the product. I think in the end you are splitting hairs trying to compare power outs of one header versus another. The kooks will probably work better on the top end for drag racing, and the LGs should have more low end and torque production for road racing or street use. I would suggest which ever one you choose go with 1 7/8 inch primaries for the Ls7 though.
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I agree. 
I'm still waiting to hear in that thread what the spike adds or if anyone has proven the spike works (I'm not saying it doesn't work; just curious if there is with and without testing to see what it does on an LSx motor).
Last edited by Ragtop 99; Feb 15, 2008 at 02:15 PM. Reason: New info
Spike is worth 1-2 HP.
You cant go wrong with eithe, however you need to decide what YOU want to do with the car. Call both companies, figure out which one you feel fits your goals and meets your needs.
Louis
You cant go wrong with eithe, however you need to decide what YOU want to do with the car. Call both companies, figure out which one you feel fits your goals and meets your needs.
Louis
This was posted on CF by andreas g.:
Actually it's orginal name was a "pickle fork" designed by ballenger headers back in the 1960's. The theory is simple, the space the fork takes up in the collector would be otherwise dead air space which would slow for a moment the exhaust velocity. By having the fork in place the exhaust velocity is maintained improving the overall performance of the header. Pickle forks are found in headers with long collectors like Kooks. I have Kooks. LG gets the job done with longer primary tubes and a merge collector. They both work well. I guess it's just a matter of preference. Actually ballenger himself made a custom set of headers for my 1984 C4 that had a 383 in it. then he moved from orange county CA were I live to Arizona. He was still working last I herd.
My experience has been up to 3500 rpms most of these headers are the same..
From 3500-7000 rpms is where the KOOKS will out pull, giving almost a .1 quicker ET, which is huge...
So basically, the KOOKS will outperform in the upper rpms, without giving anything up in the lower rpm range....
From 3500-7000 rpms is where the KOOKS will out pull, giving almost a .1 quicker ET, which is huge...
So basically, the KOOKS will outperform in the upper rpms, without giving anything up in the lower rpm range....
My experience has been up to 3500 rpms most of these headers are the same..
From 3500-7000 rpms is where the KOOKS will out pull, giving almost a .1 quicker ET, which is huge...
So basically, the KOOKS will outperform in the upper rpms, without giving anything up in the lower rpm range....
From 3500-7000 rpms is where the KOOKS will out pull, giving almost a .1 quicker ET, which is huge...
So basically, the KOOKS will outperform in the upper rpms, without giving anything up in the lower rpm range....
like everyone else said they are both very good but i would also consider american racing they can both sizes all are top notch owned both lg and kooks on two different cars nothing bad to say about either but i would consider the big tubes on a 427 imo
I run LG PRO long tubes,....I love em...the header/collector is sick,..and seen on MANY road racing applications... and I gotta tell you,..they work great on my 346ci.
..however,....KOOKS is an awesome header....so is american racing to throw in a curve ball.
However,..on a 427...i'd probably go with kooks(depending on the cars purpose and proposed power plans) but, favor the design of the LG pro's anyday over any header...on any car.
..however,....KOOKS is an awesome header....so is american racing to throw in a curve ball.
However,..on a 427...i'd probably go with kooks(depending on the cars purpose and proposed power plans) but, favor the design of the LG pro's anyday over any header...on any car.