On my way home from San Francisco last night, I noticed my motor started missing. Uh, mis-firing... Then about 30 miles down the road I heard a light ticking noise and smoke out the driver side exhaust. I pulled off the road into a shopping center to investigate. I took the oil fill cap off the driver's valve cover and saw the #3 intake rocker arm sitting 90 deg to where it should have been . Pulled the valve cover and pulled this pushrod out, luckily still in one piece. Also noticed the rocker stud had a groove, ground half way through the stud. Assuming this was caused from the rocker arm being pushed to the side. Any ideas as to what might have happened? Thanks. I should have some better and more detailed pics up later, maybe tonight.