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Discussion Starter #1 (Edited)
I've been curious about using Mustang 4.6L long-tubes for a while now. I can see how the MACs and others like them would need alterations for cylinders 7 & 8 tubes (driver's rear). Those back tubes look like they are bent too close to the engine and end up being in (or close to) the space that the steering shaft occupies.

You would think that header designs having the rear tubes bending further from the engine should allow adequate clearance. I've seen some long-tubes that look different from the MAC style. Summit offers a few that look to be built from the same jig, sold by Hedman and Flowtech. PaceSetter has a coated one that looks the same but their non-coated version looks closer to the MACs.


Flowtech 12155FLT 1-5/8"


Flowtech 12155-1FLT 1-5/8" Ceramic Coated


Hedman 88690 1-1/2" to 1-5/8" Stepped


PaceSetter 72C3230 1-5/8" Ceramic Coated

The EGR pipe would have to be addressed in any of the above. Hedman is the only one that lists their header as having tubes 7 & 8 being a slip fit.

Has anyone ever tried fitting these? And for those of you who have installed Kooks headers, what are your thoughts on using something like these? Does the #6 tube look too close?



Thanks.
 

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CableguyJJS3 installed a set of the MAC longtubes on his bird, and he only had to re-route the cyl#8 tube. Here is his thread

http://forums.tccoa.com/showthread.php?t=133912

If I was looking to install headers on a 4.6, that is probably what I would do. If you want to see if any will bolt right in, my reccomendation would be to go on craigslist and buy a few used sets to play with, that way if something doesn't fit, you can re-sell the headers and not be out much money.
 

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Discussion Starter #4
... Big thing to keep in mind is floor clearance. MACs fit MN12s because they sit relatively far below the floor on Mustangs, they're a squeeze on these cars.
If the 5.0L versions are any indication, they are a squeeze. At least my Fox body MAC headers are on my '92 Sport. No ground clearence issues with them, due to being right up against the floor. MaddMartigan ran into the floor clearance issue with his '93. And CableguyJJS3's collector flanges look real close if they're not already touching the floor.
 

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Discussion Starter #6
If I was looking to install headers on a 4.6, that is probably what I would do. If you want to see if any will bolt right in, my reccomendation would be to go on craigslist and buy a few used sets to play with, that way if something doesn't fit, you can re-sell the headers and not be out much money.
I was thinking of trying out a pair of Flowtech 12155FLT's. Or the Hedman 88690 because they're only 1-1/2" O.D. at the beginning. My thinking is that the 7 & 8 tubes should clear. And the slip fitment for those two should make the install slightly easier, maybe? As I look at these pics, I wonder now if the 5 & 6 tubes would be a problem.

When I prepared for the 5.0 header swap, I ordered two different sets of long-tubes from Summit that looked like they'd work. Neither came close during install time, so I returned them (I managed not to scratch them). I went with MACs because one of the older members installed a pair a while back, so I knew they would fit (even though he used offset rack bushings).

That's the problem, I won't know what will fit until the car is ripped apart. We know that Kooks will fit. We know that MACs will fit with some modification to the #8 tube.

The cheapest I could find used Flowtechs were for $200. $300 new from Summit might be worth it if I can return them if they don't fit.
 

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Discussion Starter #7
i hammered my floor a little.

along with the steering mod.
Nothing wrong with a BFH.

I Dremelled one or both of the flanges where they met the floor. I forget, it's been so long. I might have taken 1/8" off. It would have been nice to have had normal 3-bolt collector flanges that rotated.

I also downloaded the Mustang installation manuals for two of the above headers. Should be interesting.
 

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Nothing wrong with a BFH.

I Dremelled one or both of the flanges where they met the floor. I forget, it's been so long. I might have taken 1/8" off. It would have been nice to have had normal 3-bolt collector flanges that rotated.

I also downloaded the Mustang installation manuals for two of the above headers. Should be interesting.
my headers were free, and i cut the 3 bolt flange off, and welded a slip fit type tube on mine.......budget racing at its best!
 
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