View Full Version : Header flange material?

G.A. Ewen
10-14-2004, 10:09 AM
A friend would like to make himself a set of headers for a 350 chev engine.
Can the flanges be made from regular flat bar or is there a better choice?

10-14-2004, 11:37 AM
Mild steel, hot rolled will work fine. I would not use cold rolled due to the stresses induced. It may wanna flex when heated. Now if your tubes are SS then make your flange SS also. Also make them on the thick side, say around 3/8". JRouche

10-14-2004, 02:44 PM
You can buy header "kits" complete with flange prebent tubes and collectors. You just have to weld the whole shebang together. Summit Racing sells them. I also believe they sell header flanges.


G.A. Ewen
10-14-2004, 10:25 PM
Thanks fellows.

10-15-2004, 08:07 AM
Oh,remember to thin down or saw kerf between ports,otherwise the expansion diffrential between the head and the header will work the bolts loose.

10-16-2004, 08:16 AM
The single pipe I made for my bike needed a flange at the turbo and the muffler, and I just cut them out of 1/4" plate, drilled holes for the pipes and welded the pipe to them. Easy to work and no problems so far.