[Curt C.]

That is the cylinder where the rocker stud broke right? Looks like the rocker stud broke allowing the pushrod to jump out along with the lifter. Ask the engine builder to comment on the right studs, lifters, pushrod usage, etc to confirm that the valve train geometry is correct. Either the stud was defective or the geometry not correct resulting in the stud failing. As said earlier, the poly locks looked funny but maybe that is not the issue. Keep the exposed engine galley very clean. You dont want any dirt, dust etc to get in there. Use a clean towl or plastic bag to keep it covered while not working on it.