Stainless Steel Headers

[482supersnake]

I think most of these got the JBA tri-y's
http://www.mustangandfords.com/featured-vehicles/173-0409-1967-ford-mustang-gt500e-snake-review/
Most likely leaving some power on the table but I doubt you would notice driving on the street.

[gt350hr]

I missed something where did 1 7/8s headers come from?

      "Many" FE Mustang headers use 1-7/8ths tubing. No intent to offend.

[sixty9cobra]

not offended just trying to understand. 1 7/8 must be O.D. and 1 3/4 must be I.D.

[BattlestarGalactic]

Sorry, that was me that said 1 7/8".   Just meant use whatever they offer on the shelf and I would guess that would be it?  Maybe they only have 1 3/4"?  As long as it is stainless, I would not fret using them over paying top dollar for custom built 2".  Unless you are really dead set on them.  It is totally up to you(your wallet).

[Chrisss31]

Tubing is always measured on the outside, so the ID depends on the wall thickness of the material.

[gt350hr]

 Years back when running NHRA C and D stock , we ran better with 1-7/8ths tubes. 2 or 2-1/8th were for S/S cars.

[plovett]

The Hooker 6114's are 1-3/4" though.

[FElony]

Years back when running NHRA C and D stock , we ran better with 1-7/8ths tubes. 2 or 2-1/8th were for S/S cars.

D is/was intermediate, yes? What car? Pics?

[gt350hr]

  Yup.

[FElony]

  Yup.

Mine too.

[TimeWarpF100]

Does anyone make custom headers for a 69 mustang out of stainless? I would like at least a 2" header. Right now I have Hooker 6114 that are Swain Tech coated. I think I am leaving power on the table with 1 3/4 headers. Ground clearance is a consideration. My 464 is making about 625 flywheel hp.

On my 482 I built my own step headers 1 7/8 to 2"  Why not build your own? Stainless is very very pricey. Just to build 304 Stainless exhaust in 3" from headers back was around 1100.00 just in parts.  I do not think my 482 will make anywhere near 625 flywheel. Will soon find out what it puts down to the tire. Was hoping for minimum of 460 RWHP. 10.5 comp, CNC'd heads, Tunnel Wedge, Solid Roller Cam (bit small) Was hoping for a 11 sec 1/4 but it may not be.

[TomP]

I have had this car for 45 years and paid 400 dollars for it.

How'd you like to make a quick hundred bucks? I'll give you $500 and you won't need to replace the headers. 

I would go with 2" over the 1 7/8" and wall thickness matters too. A 16 ga tube is a smaller ID than the normal 18ga most headers are. The Tri-Y design seems to be gaining in popularity amongst race cars. It's important that the tubes be joined in the proper firing sequence... #6 and 8, not 7 and 8 even though the steering complicates that.
The headers I made for my 61 wagon were 1 7/8" off the head for about 14" into 2 1/4" tubes for about another 20" and then  3" collector. Having only two tubes 2 1/4" diameter pass by the starter is easier than trying to get four smaller tubes past.

[jayb]

It's important that the tubes be joined in the proper firing sequence... #6 and 8, not 7 and 8 even though the steering complicates that.

I beg to differ, Tom.  The header tests detailed in my book show that the FPA headers (where 7 and 8 are joined) performed identically to the JBA headers (where 6 and 8 are joined).  The theory on joining 6 and 8 is good, but some engines will not care...