Gordon0652

iTrader: (4)

I am having a 440ci LS7 built with some AllPro WCCH LS7 heads w/ a 200 shot to go in to my 2000 T/A. I would like to get some headers from KOOKS.
I am wondering do i need to go with the LS7 style flange?

Something like this?
http://www.byunspeed.com/product_inf...oducts_id=6272

Also what would be the best kind of headers for my car size wise? 2 x 3 1/2? 1 7/8 x 2 x 3 1/2?

Thank You!
-Kenny

tektrans

iTrader: (23)

I didn't know they had diff style flanges.
I hace a 441 Ls7 and I have the 1 7/8 but if you're going to be spraying I'd go with the 2"

ddcarter

iTrader: (14)

Yes you need LS7 flanges. I just had a set of ARH made to put a LS7 in a C5. The top of the exhaust port may cause you some turbulance.
https://ls1tech.com/forums/generatio...-question.html

Gordon0652

iTrader: (4)

Thank You for clearing that up!

tals7

yes you need d-port flange.i have ar 1/78 d-ports.

5.3litre

iTrader: (6)

I really don't think it matters. Looks like "tektrans" Has the regular round-shaped flanges and he's running 9's. lol

tals7

you dont have to have them but you need them.they flow better d-port head to d-port header.tom at ar can explain.but if your not after every last bit of power it dose not matter its up to you.

Tom@ARH

If I was spending all that cash on a setup I would want the correct everything. If you already have a set of headers big enough to handle your new setup than yes they will work. But if your going to buy new ones why not get the right part the first time.

ramairws6

iTrader: (33)

I have the LS1 flange on my 1 7/8 to 2 inch stepped and was told by many different respected builders and tuners that it will not matter either way. Hell, I even called Kooks themselves and asked and they told me not to even worry about it because the differance was nil'. You would definately think a company trying to make money by selling you a new product would try to sell ya on the flange change if it was true wouldn't ya??

Gordon0652

iTrader: (4)

I am going with the LS7 F-body headers. Because they are made for the "D" port and piece of mind.

Thank You all!

tektrans

iTrader: (23)

Yeah in my case I had these headers from my previous set up so even if I knew about it, which I didn't until this thread, I wouldn't have changed it if the difference wasn't going to be much at all.
Since your ordering them for your upcoming set up-sure it makes total sense to get the d port flange, there's no reason at all not to.
Good luck with the motor, keep us posted on the results!

ddcarter

iTrader: (14)

ARH doesn't charge more for the flange upgrade.

ramairws6

iTrader: (33)

No, I allready had the oval port flange. The statement was made in reguards to upgrading to the LS7 type flange from the LS1 style.................

ddcarter

iTrader: (14)

Sorry I misread, not trying to offend anyone. I was thinking that it was a hundred dollar upgrade from kooks for LS7 flange on a new set.

ramairws6

iTrader: (33)

I actually asked Kooks awhile back and I think they said $175 if I sent my used set into be reflanged but they told me it was a waste of time and money.

tals7

tom at arh,s has very good point.

99blancoSS

iTrader: (115)

We're running All Pro LSW heads with ARH 2" primaries, 3.5 inch collectors and Y to a 4" catback. 4" transition after merge collector in Y.