Quote:
Originally Posted by Gary H
I know this isn't much help but it sounds like valve train noise to me. Have you tried removing one plug wire at a time while it's running to see is the noise changes on a given cylinder?
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I agree Gary, its too slow of a knock to be Crank Speed Related. I stated long ago to crank it up cold, and get a hand on the engine and FEEL for the knock, Valve covers, Valley Pan, Etc. It has been stated by people here,in the know, that its near the rear/ Distributor area. The Valley Pan is the only item near the distributor that could transmit any cam speed rhythmic noise. 20 minutes and that valley pan could be off. After the engine being apart, I cant imagine it being anything "catastrophic".