STEELCITYFIREBIRD,
We have run the motor with the passenger side valve cover off. Here is the video.
https://www.youtube.com/watch?v=KAwSYevxsb4
The knocking is more noticeable at lower RPM and is drowned out with more RPM. The knocking noise is predominately on the passenger side. It's definitely not an exhaust leak. Thats been checked about a dozen times.
dataway,
We ran another distributor and plug wires and the knocking noise was still present. The tech also added a gasket to my original distributor and the sound did not change at all.