Fitting TTi headers on a 273

67 Barracuda uk said
Hi Mattax
Thank you for your in-depth reply.
I have my own engineering company in the uk.
Ive been in business for 31 years.
Your right these header dimensions for fitting might be slightly different to my heads.
I’m just going to draw the heads and the new headers on AutoCad.
From this I will see how much weld I will need to put on.
I would be able to get a good match when welding and dressing.
I will have to be careful with the heat so nothing starts to bend.
I will put a straight edge along the headers afterwards to see if they are flat.
At least I can do the job and use them.
Regards
This is my first post on this site.
You people are so helpful.

We never came up with a good reason why there was so much tolerance allowed from head to head. All I can say is we were not the first to see this. For whatever reason Chrysler apparently didn't see the need to hold a close relationship from the mounting bolt pattern to the port openings. You'll find this to some degree on the intake side as well.

If you have the capacity to machine the flanges flat IMO you'll be far ahead of the game in terms of sealing. And if they are actually straight and flat you can cut away the excess flange between center ports and the ends. I wouldn't do that with TTIs normally because the centers help pull the ends flat, or flatter anyway.

PS. If you do need to recoat - look into Zircotech on your side of the pond for several nice zirconiumdioxide options.