Don, Hard to answer your questions, because the timing was always retarded on it. Since it was so retarded it caused it to run rich as crap, which in turn made it misfire. It was misfiring(running rough) at all times. Before, it only knocked mainly when it was at idel, but when the timing is where its supposed to be, its always present. I already checked the rod bearings, crankshaft(main?) bearings, timing chain, and push rods. I dont think its piston slap, because i would tend to think you could feel it doing that, and when running, putting my hands on the valve covers. I even got a metal pole and put it up to the exhaust pipes(headers) and no difference between cylinders. When the timing is retarded, it sounds more so on the top end, drivers side. With is set in the right spot, you cant tell at all. Thanks for your time- Tim
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