I hope its just a bad lifter or a rocker arm and nothing serious,I plan on tearing into it this winter to see if its something simple. I am going to pull the valve covers off and bump the motor over and see if all the valves are opening and if they are I might change the cam to the one I wanted and check all the rocker arms and push rods for wear,if its a bad cam I will look for another motor to get me by until I can build the motor I really want.