Final answer:
Stuck valves and improper valve timing can both cause bent pushrods.
Step-by-step explanation:
Tech A is correct. Stuck valves can indeed cause bent pushrods. When a valve gets stuck in the open position, the pushrod continues to apply pressure, leading to bending or even breaking of the pushrod.
Tech B is also correct. Improper valve timing can cause bent pushrods. If the timing is off, the valve may be opening or closing when the piston is at the wrong position, resulting in contact between the valve and the piston.
Therefore, Both Tech A and Tech B are correct in their statements.