Fired up my new engine today and while warming it up and seating the rings, after running about 8 minutes (water temp about 165*), it started to sound noisy, like valve adj loose, oil press good, brought RPMs up to about 2500, and it popped back through the carb. I thought it may have closed up a plug, but pulled Valve cover, the #5 ex rocker adj screw lock nut had backed off and fell onto the head, push rod eat up the alum rocker arm. What the He**??!!
After I set the valve lash cold, I went over the nuts with a torque wrench, so I know it was tight. But to loosen and fall off after only running for just a few minutes, it would seem that it was left loose.
Anyone got any other sugestions? Why would a nut loosen? All the rest were tight.
Anyone know where to buy 1 MP alum roller rocker arm??

Thanks guys, Brian Dunnigan