think the 2 inch would be a better choice than 1 7/8 on a 402 thats going to see a good amount of spray, or is it overkill on that small of a motor

 

X2 I would like to know this as well.

 

It depends on what a good amount of spray is. LOL my car picked up from straight 1 7/8 to 1 7/8-2 " stepped. last year on the 400 shot. Im pretty sure these will pick up again. but if not i still have my stepped headers. But kooks have a great design and id bet as long as you have 400+ cubes and at least a 200 shot it will not hurt anything.

we put my headers on a 427 all motor car runs 10.0 @ 138 on the motor and it did not loose anywhere over the 1 7/8 straights so id bet add a 200 shot and theres enough exhaust need for the bigger tubes.

 

what about for n/a. I will have a 200 shot, but typically don't use it unless going to the track. Are 2" going to be overkill na on a dialy driver that occasionally goes to the track?

 

You'll need big cubes and alot of spray to back up a 2" header. I personally believe that a 2" would be a bit big in the 450 ci range N/A. I got the 1 7/8" stepped to 2" for my 454 n/a build. I'd stick with the stepped until it is a restriction just for the scavenging.

 

Is that the pic of them? 7-8 look shorter, unless theres a hidden loop in there?
I wish I had a motor that could use this,

 

George,
Will Kooks have any offerings for headers purposed for the new Tall deck (GM-LSX and World Castings-Warhawk) blocks. What vehicle platforms will be produced first? Production timeframe estimates?

 

Received my 2" to 3 1/2 last week. These things look great. I will let you guys know how they fit soon here.

 

would a blown 427 be a good candidate for these?

 

Ive emailed kooks twice and sent them a pm as well about getting a set of headers made and they have yet to get back to me on any of them......not what I call great customer service.

 

How about something bigger than 1 3/4 stepped to 1 7/8 for the LTX crowd?....

 

How will these fit with a Mad Man mid plate?

 

also interested for my 408(n/a currently, 200 shot later). its a daily driver and i know i need new LT's, i almost pulled the trigger on the 1-7/8" stepped to 2" set earlier this week and will now wait to hear some results of these especially for the smaller big cube motors.

 

anything less then 427 ci and I don't think these are needed unless you're also running a blower, or are spraying 400 hp of juice.


for a 440+ ci lsx, these are a shoe in IMO

 

I heard you're going turbo, no need for headers

 

KOOKS provides top notch service at their facility to match their quality products.

Check out some of their custom work:

http://www.gmhightechperformance.com..._am/index.html
http://www.gmhightechperformance.com.../photo_03.html

..and one of the highest viewed posts in Generation III External Engine:
https://ls1tech.com/forums/generation-iii-external-engine/599926-kooks-3-true-duals-over-axle-exhaust.html

 

Ahhhh..... The weasle wire. Faster than the internet but like the internet it can have bad information.

We'll see.

 

Turbo? I heard blower? WTF? And I thought I changed my mind a lot

 

Gonna have the blower feed the turbo(s). Dem is sum rite purty headers. Saw them at the shootout.

 

Well... I would say these headers work great!!
I picked up almost 2mph on my 370ci motor.

Check it out ....
https://ls1tech.com/forums/nitrous-oxide/815191-another-new-best-thanks-kooks-2-race-headers-another-broken-oil-pan.html