I put my exhaust back together on my chevy 52, 3100 with the 216. Everything I observed with my exhaust concurs with the comments above by "tclederman." I got the donut gasket through classic truck parts, but you can obtain it through napa auto parts as well. Additionally my exhaust pipe does have the flange welded too it. The pipe itself is not flared. The donut sits over the pipe. The manifold has a "bevel" in it..(for lack of a better term) to accept the donut. 2 bolts mate the two together.(don't forget a little anti-seize)
