you wont hear the valve hit the piston.unless the valve came free from the valve keepers and fell into the cylinder. take and check rocker arm movement to see if there equal movement or lift.or excess rocker arm play or valve lash
this can help determin if you bent the valves if they dont lift the same hieght or the rocker is really loose. and a compression test would be a good thing to do also to make sure
-corey-
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