Are you saying that the belt/s display runout (eg Out-of-Round condition) when spinning on the crankshaft pulley? If so, then perhaps the teeth on the new belt/s are defective... I've never heard of such a thing though.. Guess I have to ask, How Much is the Runout?...After making the replacement, I see that there is a little bit (I don't know how to measure this) of runout of the crankshaft pulley when the engine is running. While the belts were removed, I checked the cam shaft and crank pulleys, finding no evidence of looseness or keyway wear...