How do hydraulic flat tappet lifters fail?
Well I for one consider this a good sign. Only one lifter and lobe. That clearly means the lifter was not spinning in the bore, which was the cause of the failure. So at least you know what did it. I would bring that thing all the way back down and get it as clean as humanly possible. I always run a brake cylinder ball hone through the lifter bores to assure they are not too tight and to clean them up good. Good luck.
