Those are Smith Brothers adjusters and pushrods, and both are still in perfect condition. The adjuster had not backed out at all. The threads were beaten in the rocker, allowing me to twist the screw out by hand. The point of failure was overheat at the shaft to the point of weakening the aluminum and allowing the bottom to stretch apart and fracture. The rocker was so hot it was burning the oil spray. Notice the adjacent rockers are clean. I would say looks as if it ingested some debris and blocked the oil passage. I'll know more when I get it apart tonight. The discoloration on the end of the pushrod is burnt oil, not metal bluing.