Camshaft knocking problem

[california dean]

If the above checks don't find the problem, you might try removing the oil pan and checking the crank assembly to cam lobe clearance, especially when the engine is at the point of rotation where the forward movement of the cam is observed. Anything changed on the crank assembly, like added counter weights, different rods, bolts, nuts, etc. could be contacting the side of the cam lobe, pushing it forward a slight amount with each rotation. Some engines have very little clearance between parts in this area. A suggestion anyway. Let us know what you find please.