"In a Tri-Y design, the pressure of additional area changes (where the primary pipes become secondary pipes) produces additional reflections, so the Tri-Y must be designed in a different manner with respect to wave control. Given this, the area of the Tri-Y header between the first and second collectors becomes critical.The principle behind tri-Y design is that the most effective port separation occurs by pairing the cylinders that are firing farthest apart."

I dunno guys, i was told headers like the tri-y's designed for a 302 would be different then one designed for a late 5.0, due to the firing order.

 

If you want tri-Y's then why the heck did you post a link to long tube headers in your original post!!!! Everybody is telling you about long tube headers because you posted a link to long tube headers.

 

Long tube Heddmans are not Tri-Y's....

Check out the Clipster mid lengths...good alternative to long tubes.

 

whoa, relax...so i was miss informed, when i saw those long tube headers it looked like a pair of tri-y's that i almosy bought but, was told that wouldn't fit. They just look simulair

 

These Patriot Clippster's will clear your linkage issues and are a good deal at $175 bucks.

 

Will the patriots clear the shock towers?

I just completed mine 5.0 Ho and T5 swap. I used Headman mid length headers for a 65 mustang automatic and modified the driver side collector tube. I cut (2) 3/16" to 0 wedges from the collector to make 2 bends away from the cable mount on the T5 bellhousing it was fairly easy to do although I had to triple check my math before hacking into new headers. The headers cleared my unisteer rack pinion steering shaft with a lot of room to spare. I can only assume it would clear the stock steering set up.

BTW, it runs great with an air gap manifold and a double pumper.

 

+1 with ochohill. Will it clear the cable clutch? Who sells them for that price?

 

which is not needed for a V8 (equal length), supposedley does't improve a thing. and yes, firing order has nothing to do with header selection

 

i think that the first thing you need to decide is what you actually want in a header. There are tri-y, long tube, mid-length, and shorty as the choices as I see them.

Firing order does matter on a tri-y as they pair cylinders by firing order, but firing order makes no difference on any equal length header design.

Getting that out of the way, your 5.0 is a 302, so the engine will be happy with any equal length header design for 302 or 5.0 engines. Clearing the body parts and parts that were original to your car from 1967 is also easy as you can just use any 302 equal length header design for the 67 mustang. Clearing the cable clutch of the T5 is therefore the problem. If the clutch setup is an aftermarket setup then call the manufacturer of the cable clutch setup you have and ask them what headers will work. They should know. I believe that the Modern Driveline cable clutch on the T-5 will work with Heddman, and JBA headers from research I did because I considered it for my mustang. Here is whatt their website says:

Warning: Clutch cables do not work with all long tube headers. Long tube headers were designed long ago to clear linkages, thus were tucked tightly in towards the block. There are headers designed with cables in mind from suppliers such as Ford Powertrain, Hedman, JBA and others. Please check yours. Cables bent to clear the header are not subject to warranty when they do fail.

Other than that, you could go with shorty headers and not really have to worry because they don't come down far enough to interfere.

 

Summitt has those for 175