Exhaust donut?

mbaird said

Really ? Its been a while but I seem to remember late model BB manifolds using a flanged headpipe and these donuts..

Click to expand...

I can not tell from the picture. I was thinking of 60's or 70's small blocks where the donut is cast into the flange. If that is the case, I stand corrected. Thanks. My big block manifolds use a flat gasket.