I have a 305 TBI for a 1988 Camaro. Recently it started making an intermitent squeaking and knocking noise. I removed the serpintine belt and the noise persisted, so I don't think its in the pulleys, waterpump, etc. Any ideas?
Years ago I had a motor that burned up the crank bearings and let the crank move up so that the flywheel was grinding on the back of the block. Don't want to scare you, but it did make the noise you described.