Bent pushrods can also happen with coil bind and valve spring breakage can be from coil bind. Instead of pointing fingers at what is already a bad situation, concentrate on the cure. Do a leak down test on all cylinders. Make sure you have at least .060" valve spring clearance. from spring compressed solid to max. valve lift height. Also make sure pushrods are strong enough for the spring being used. Get a shop manual for tune up specs and make sure TDC on damper is correct.
