$530 Mark VIII direct fit Kooks 3/4 length headers

L

LincolnMan

Registered
Anybody here tried these yet? This was mentioned at the end of another post. The price looks good and if there are no modifications required this could be a great choice.

http://www.supercoupeperformance.com/
http://www.supercoupeperformance.com/4.6L Headers.htm

here's the blurb from the website:
4.6L SCP/Kooks 3/4 Length Torque Headers
1 5/8" Primaries, 2 1/2"Collector. Includes the EGR tube adapter and the O2 Sensor fittings.
We offer these for the 2-valve or the 4-valve cylinder heads. They can be custom ordered for a direct fit into a Lincoln Mark 8 too!

they claim 30hp and 15ft/lb increase. my next question would be is there any way to cram high flow cats in between the headers and double X pipes or does one X have to be sacrificed?


Jason
'94 Mark VIII
Portofino Blue/Portofino Blue
http://www.markviii.org/~lincolnman/

http://www.markviii.org/~lincolnman/sigpic.jpg
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

They also make bigger ones.

"If desired, 1 3/4" primary tubes and 3" collectors are available as a $40 option."

Am I better off getting the bigger ones, or not?

Also, if they have midlengths, when are they coming out with long tubes? My friend bought midlengths for his cougar, then they turned around and came out with long tubes like 2 weeks later. Needless to say, he was pissed.
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

The reason Bill is selling the 3/4s now is that it is the same exact header they make for the T-bird, but for 4V heads. They just added EGR fitting and that's it. Does Kooks make the longtubes for the T-bird ?
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

Right but they already have the jig that takes the tubes past the steering shaft. At that point all they have to do is use longer tubes and bend them straight back, right? My friend Dave has their midlengths on his cougar (supercharged xr7), two weeks after he put them on they came out with long tubes. So i'm hesitant.
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

My friend Dave has their midlengths on his cougar (supercharged xr7), two weeks after he put them on they came out with long tubes. So i'm hesitant.
Click to expand...

Tell Dave to get signed up here and participate a little with us! ;-)
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

He doesn't have a computer. If he wants to access the net he has to use his moms computer on dialup, so he never does.
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

I spoke with Bill many times, and he never even mentioned long-tubes. Plus he already has like 7 or 8 orders in on the 3/4s so I guess people will start installing them real soon. You know you should do this too ... LOL
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

I'm not waiting for someone else to install them, i'm waiting for long tubes. At least that's my excuse. I'm really waiting to be able to afford them :).
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

long tubes are the best. Butthe midlegnths are a helluva lot better than stock.
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

"Long tubes are the best"

header$ = $$$
in$tall header$= $$$$$$
cat-back $y$tyem = $$$
$ince header$, and every thing about them i$ expen$ive we all want to do it right the fir$t time. I too am waiting for long tube$.

I think everyone is tempted to buy those mid lenghts, but with all the money involved, we want to get as much power as possible

Mark of the Cobra
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

Oh I would just Love to see the dyno numbers between the mids and lt's.

You would be surprised.

This is the mid's.

We dynoed our test car recently and it picked up 30 rear wheel HP and 15 ft-lb of torque after the header installation!!
Click to expand...
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

Geno,
or any one else qualified to answer this, is there a major horsepower/torque difference between mids and long tubes, numbers please? If there is not that much difference it might convince more people to buy the mids.

I am under the impression that long tube will blow away mids, I think a lot of people are under that same impression, is that true or false, numbers please!!!

Mark of the Cobra
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

From looking at the stock exhaust manifolds , my guess the biggest gain comes from eliminating the log manifold at the head side, using any header. What is left after that common gain ,no matter what header is used, is what we are talking about ,in is one better than the other.Long tubes in general do develop more low end torque ,provided the extraction ability is not lost by the fact that the pipes have been modified to fit the Mark motor.Tube diameter and length , and position of the tubes ,all work together to create a suction at the exhaust valve that pulls out the exhaust.It is a fine balance and can only be tested on a dyno or flow bench to know how well they work.I don't want to say which headers are better ,I don't have flow characteristics of either set to compare . However if I am correct in my opening line , how much low end torque is lost on the mid length ,compared to long tubes , and might a rear end change develop 5 times the torque difference between the two sets of headers.There is another post to be had on the placement of the "x" or "H" balance tube that also affects header effeciency..Another time..Also 1 5/8 dia. with 2.5 collector is good to about 400 HP , Larger than that on smaller motors could actually decrease extraction , as velocity is lost...
 
RE: $530 Mark VIII direct fit Kooks 3/4 length headers

I now have these headers in my possession ... They are what we called shorties years ago , but I know there is a very short set out there for the mustang , thus making these 3/4 length...They are very well made and are flow maximized for there length..The very impressive HP numbers bear out my above theory that most of the gain comes from cleaning up the exhaust exit path at the head.

Geno .... tubes are maybe half the length of standard headers , my guess is "long tubes" are standard lenght..therefore the long tubes should lower the RPM range of the increases , although the HP and TQ #s were very impressive the RPM range of these gains was not posted ..Getting too much more increase out of LT headers I would have too see, maybe a little more TQ but Ill bet the RPM range of increases would be lower...Your opinion Sir....I too would like too see a comparison Dyno run even of two similar cars and see the RPM ranges..

For you guys wondering what to do , I like the idea of putting the cats in there stock position ,staying legal in most states.. I also think the #s are good ...if you are looking to pull every ounce of HP out of your motor you might get a little extra out of long tubes and maybe at a slightly lower RPM range but nothing that cant be made up in other ways...Excluding a few a you , how many guys out there are going to do head changes , cam changes , intake changes etc to maximize HP , if you are not ,3/4 headers are fine..I could be proven wrong, but I don't believe long tubes will blow away 3/4 length ,there somebody has said it !! Ill probably catch all kinds of flack..
 
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