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Originally Posted by 67 SS
...I finally found out the donut was slowly shifting around due to a missing piece.Pull the pipes down and make sure there is something that will hold the donut in place.My driver side manifold had something to keep it in place but the passenger didn't.
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Good call. When I removed my very original exhaust off my K10's 350 last December, I found a loose, ~5" tube of exhaust pipe within each exhaust pipe that connected to a Rams Horn collector. The tubes fit inside the donut and had a step down diameter halfway to keep them from falling into the exhaust pipe. Obviously, the tubes kept the donuts from collapsing inwards. No doubt, they contribute to keeping the exhaust pipes tight against the collectors.