[1930u]

Hi all-

A friend of mine is helping make these header flanges for the 392 Hemi. We used the exhaust gasket as the pattern. We still have to drill the rest of the holes. The material is 3/8" 304 Stainless Steel. I need to transition from the traditional D-Port geometry to 2" round Stainless Steel tube. My question is how to do it, or does anyone know if I can by transitional nipple to do this? I'm using 2" Stainless tube .065 wall thickness.

Thanks in advance... 1930u

[ericnova72]

The way I have seen this done is a plug form(like a trailer ball, but in your case oval) is made, the tube is held in a vice and heated red and the form driven in to force the tube to the flange hole shape. What I saw was taking a round tube and making it square by driving a rectangle form into a red hot tube, for making square port headers.

You might try Burns Stainless, Stahl Headers, Headers by Ed, or Schoenfeld Headers to see if they have a ready made cone tube.

[Centerline]

I would call Bob walker at HotHeads. I purchased his flanges and they came with short transition tubes already welded in place. All I had to do was continue from there. He may be able to tell you where he has his done or how they were done which might help.

In the pic below I have welded turnouts to each one to get the exit straight out the side before I could fabricate the rest of the headers.



Welded up.



Jet Hot coated with 14" home made mufflers in the turnouts.



Centerline
HotRodsAndHemis.com

"Instructions are just the manufacturers opinion of how it should be put together". - Tim Allen

[gow589]

When I built mine, I welded the outside around the flange. Then I welded the inside then ground it down smooth with a die grinder to match the port.

[1930u]

Originally Posted by Centerline

I would call Bob walker at HotHeads. I purchased his flanges and they came with short transition tubes already welded in place. All I had to do was continue from there. He may be able to tell you where he has his done or how they were done which might help.

In the pic below I have welded turnouts to each one to get the exit straight out the side before I could fabricate the rest of the headers.



Welded up.



Jet Hot coated with 14" home made mufflers in the turnouts.



Centerline
HotRodsAndHemis.com

"Instructions are just the manufacturers opinion of how it should be put together". - Tim Allen

Hi Tim, Great minds think alike. I recently found your 32 project page and was shocked to see you had already built your headers around the Big Chevy. That's exactly what I had planned but I am using stainless. I discovered the big block concept by pure accident when I was cleaning the shop a few months back. I had a bunch of headers gaskets laying on the bench and that's when I saw how similar the tube arrangemnents were. Wow you proved it. Yours look great. I hope I can pull it off too and will give Bob W a call too. Thanks

[1930u]

Originally Posted by gow589

When I built mine, I welded the outside around the flange. Then I welded the inside then ground it down smooth with a die grinder to match the port.

Those are some sweet tubes. Thanks.

[matts37chev]

wow thats cool, what made you think of the 2 into1 with the 2 into 1 mufflers
what are they going on?

[gow589]

Originally Posted by matts37chev

wow thats cool, what made you think of the 2 into1 with the 2 into 1 mufflers
what are they going on?

Pantera. Actually these failed. The 2 into 1 was paired wrong and was really messing with back pressure. If you do 2 into 1 they really have to be separated by 4 cycles which is not possible in this firing order. I completely changed the design to 4 into one. After spending the money to get these ceramic coated they will look nice on my basement wall!

I made a second set which are not as attractive but take the 4 primaries over the suspension and a custom built muffler on the back side. It is not near as attractive, but fix some other fundamental issues. One was port matching. I really did not do that good of a job on the first one and the photos of the ports ground down are actually on the second set.

Now that the car is painted I hope to begin testing this set soon.

[gow589]

Originally Posted by matts37chev

wow thats cool, what made you think of the 2 into1 with the 2 into 1 mufflers
what are they going on?

I didn't answer your question. Designed to go over the suspension instead of through it. It is not possible to get much exhaust through a Pantera suspension which is the norm.

[1930u]

Originally Posted by gow589

I didn't answer your question. Designed to go over the suspension instead of through it. It is not possible to get much exhaust through a Pantera suspension which is the norm.

Pantera exhaust is a pain. Would love to see your car. I really like them.

[gow589]

Originally Posted by 1930u

Pantera exhaust is a pain. Would love to see your car. I really like them.

Have you had one? Worked on one? I just finished the paint job. Several of the parts are hand made from scratch out of aluminum such as air dam, hood, side vents:

[1930u]

Never had one but I will say I've always wanted one. I came close to buying a 71 a few years back. It was fully documented, original engine, etc. Also no rust to be found. It was a great price at $30K. The economy was diving and I'm into a Hot Rod project so I walked. I'm going to start searching again after the economy comes back and my 1930u is done. My goal is to find or build a daily driver Pantera. Yours looks great and it's nice to see you went away from the normal color scheme.

Here's my weapon of choice right now.

[gow589]

I like your Vette! Problem is there are too many cars to chose from. A serious attempt at any project takes a lot of time and resources.

[1930u]

Originally Posted by gow589

I like your Vette! Problem is there are too many cars to chose from. A serious attempt at any project takes a lot of time and resources.

I here you brother...check out my Journal.

[gow589]

I started this morning. I am still cut'n and buff'n. I will look over it more this evening.