Today I was giving the 503 (59 GMC) a good workout through the gears, revving a little higher than usual, and the exhaust pipe blew out of the manifold. Can any of you who are in the know tell me the connection method used? I haven't looked closely, but the top of the pipe looks straight (no donut). Does that mean that there was some sort of packing - or was there a lip that has rusted off?
