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Message: [QUOTE="bclark001, post: 1234560, member: 80156"] I'm with Papakeith on this if that is an interference engine (wich im pretty sure it is) then if the valves hit the piston there bent I/ve seen valves hit pistons on many engines and still run but the valves were bent and had a tremendous loss of power. when that valve hit the piston :bang: and put a slight bend in the valve stem when it closes it is not going to seat/seal properly causing compression loss (the enemy of a strong motor) and since there is not much of a load w/o it in gear it will run fine but when you put it in gear you have created a load and the engine is not powerfull enough to get ya going. that being said i wouldnt run it anymore as further damage may result in a extremely damaged head. remove the valves and roll them on a flat surface or take the head to a machine shop for inspection also inspect the piston w/ a bright light to check for marks/crack good luck let us know how it goes ~Brian [/QUOTE]