ok sry it's kind of hard to explain and my camera broke just last week. The valves did not damage the pistons and the cam still moves to answer those questions. now to explain. you know how the cam gear slides onto the cam and there is a a single tooth on the inside of the to make sure you align the gear and cam together? well somehow the tooth on the timing gear for the cam split the cam's end, and now the cam gear can rotate about 10-15degrees easily.