Got a weird one. The pushrod on number eight intake fell out of the rocker arm today. Noticed it immediately when the motor fired up. Slight miss and mechanical ticking sound - hard to distinguish from the normal racket the roller lifters make.

Motor is a 400 based 512 with Comp Cams retrofit roller lifters and adjustable rockers.

This is the second time it has done it. Same hole as last time. Some of the photos show damage to the rocker, adjuster and scuffing on the pushrod end. Lash is set the same as the others. Inner and outer springs seem to be ok. Motor is three years old now with a few thousand street miles. Any ideas? I'm just fishing for advice before I pop the intake to inspect the lifters.

Thanks...