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One of the roller lifters had failed. Most of the time when a roller lifter breaks, the bearings have failed and the wheel locks. Once the wheel stops turning, the engine becomes a lathe, grinding down the lobe on the camshaft. Not only does this trash the cam and potentially damage the rocker arm, pushrod, and valve when excess lash is introduced, it also sends metal throughout the engine. That's what we call a bad day.