Originally Posted by Scott98

I wouldn't go quite that far. I've seen a brand new valve guide with the valve inserted and there is the tiniest bit of play. The only way to be certain is to measure the lateral movement of the top of the valve stem and see if it is within spec for your engine. I agree, the amount of movement is very, very minimal, but it is detectable. If you don't have anything to measure it with, you can always do a comparison with all of the other valve guides in the engine - seeing if some are clearly more worn than others. Chances are your exhaust valve guides will have the most wear. Be sure to push the valve in some and try to wiggle it to get a good idea of how much wear you are dealing with. Just my thoughts.

Scott