I have a 1970 C50 with a 292, some where there is a exhaust leak at the manifold, thought it was the doughnut so I replaced it ( was leaking there) but it is still loud. I know that they were prone to cracking, but I can only find 1 hair line crack Definitely not big enough to make this noise. gasket at the head, and where the two manifolds go together look ok. It is hard to see the backside are they prone to cracking there? also will a manifold off a pickup fit?
