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My guess would be a collapsed lifter. I would think if a lobe on the cam went bad at 800 miles there would be a lot of metallic debri in the oil. are you sure the push-rod is seated in the lifter and not off of it?? Take the rocker arm off and use your hand to see if you can collapse the lifter. If you had the valve lash too tight you could have bent the push-rod also.
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