I recently traded for a D-14. The previous owner had the head rebuilt, the valves seated etc. It missed bad and would not pull itself on the trailer so I winched it on. When I arrived at my place I started it and backed it down the ramp. I advanced and retarded the timing and no help. I removed the rocker arm cover and started the engine, some of the rocker arms were not meeting the push rods. I adjusted the rocker arms to meet with the push rods, noticing that at least one push rod was bent. I started the engine and the throttle was wide open and the engine roared. I backed the throttle off and the engine died and I noticed one of the push rods was bent bad enough to be missing the rocker arms. I then loosened the rocker arm assy and removed the push rods finding four of them bent. My question is; what caused the push rods to bend? If I replace the push rods with good push rods, will they bend? Do you suppose the valves are hitting the pistons? What do you suggest as my next step? Thanks for your help. If the engine were out of time, why would it have started and ran at high rpm?