Plugs don't hit the valves, the valves lap open and hit the piston.
Easiest way is to remove the valve cover and see if a valve stays open when the cam face is not depressing the valve. The valves should follow the cam lobe and a bent valve will only follow the lobe during the peak of the press.
Next easy way is to do a compression test.
Usually its intake valves that bend.
Easiest way is to remove the valve cover and see if a valve stays open when the cam face is not depressing the valve. The valves should follow the cam lobe and a bent valve will only follow the lobe during the peak of the press.
Next easy way is to do a compression test.
Usually its intake valves that bend.