Ok, on my 496, internally balanced, I have this tapping sound coming from the front of the motor. I took off the clutch fan, to see if that was the prob, still does it, then I took a piece of vacuum hose, and made a stethoscope. I cant find the noise anywhere. Probed all around the oil pan, the water pump, timing chain cover, manifold, heads, valve covers, everywhere I can think of. I swear it sounds like its coming from the crankshaft pulley/balancer. I checked the bolts on the front pulley and they are all tight. Anyone have any ideas? The tap seems to be most evident at idle, it doesnt always do it, but when it does it, if you tap the gas, it does increase its speed, with rpm. But like I said, it isnt always doing it. I usually notice it when the engine is warm, cant recall hearing it when the engine is cold. Help.