What is everyone running on b1 originals for header gaskets? What kind of luck is there with copper high temp silicone?

I have always only used silicone. Just need flat flanges and it works fine.

I use remflex rf6019 gaskets.
Flanges don't need to be real flat.lol

i make my own, i go to gasket company here in town and tell them what i need and use styrofoam paper plates to make the templates then scribe on the gasket material and cut them out,i got lucky last time at the gasket maker supply house and got asbestos material and that stuff is down right tuff and last forever, it lil time consumeing but each port is made exact to the head and header

Asbestos, huh? Do you prime your block with red lead primer?

R.

I use Mr. Gasket 5944