since this comes up enough maybe this will help to explain it
Originally posted by Terry Haines @ FCO:
...it's double answer.IF you get lucky its 'non',that is if the engine dies with the cams 'in sync' your OK...BUT if an intake or exhaut cam gets out of sync the valves can hit each other.If after a new belt the engine has no compression ,odds on they have 'kissed' each other.It doesn't take much to bend the valves as they have very small dia stems........
