S52 headers Cast or Mild steel flanges?

[armstr0ng]

I'm having someone weld up the air ports on the flanges of my S52 headers and I need to know if it's mild steel or cast?

While I'm here.....what is the best way to plug the air ports? just a small plug of steel? I have heard of completely filling the port but I would need to deck the flange. I don't think I have that option.

Any help would be appreciated as I'm bringing the headers in for welding today.

[ZUUD BYE]

resently replaced the rear one- flange does not look cast. I would say mild and all the tubes are welded to the flanges on both ends. Hope this helps.
As for the air port on the flange- my thought would be to weld a "cap" over it vs filling in with welded bead.

[armstr0ng]

Thanks a lot man. That should be all the help I need. :D

[RRSperry]

Ehhh Stainless... The 95 was cast, the OBD2 were SS, as is the rest of the exhaust.

[armstr0ng]

Yea, nevermind. They are stainless including the flanges. I wasn't positive about the flanges.