Push rod & rocker arm separated
All last week, I was tracing a terrible miss in my 258. New plugs, new wires, cap, & rotor (TR upgrade). Timing perfect. Everything was great, but #4 cylinder wouldn't bang. Valve has to be the problem, but I had 120 lbs. on the cylinder (18 years old and 80K miles!). When I took the valve cover off, there was the #4 intake pushrod just sitting in it's hole and not pushing against anything. It had detached from the rocker arm. No signs of wear or damage, just didn't like where it was and decided to move. What would cause this to happen? Any ideas?