I did a few oil changes on it last night and ran some SeaFoam through the crankcase then put some quality oil back in it. While under there I did not notice any dents on the oil pan but I wasn't looking for anything like that either. It still tapps, if I reve the engine by hand I can feel the tapping so something is definitely knocking against something. RamAirZ has given me some great suggestions as well. I think my next step is to take the valve cover off as the noise sounds like it is coming from where the cam gears are. If all looks well there then I will dig further and see what the timing set looks like. While it is running it idles and reves smooth.