[blykins]

I'd pull the pan and look around...pull a rod bearing and make sure it hasn't been scarred. Clean the pickup, change the filter, etc.

You could call Dove and see if they sell individual rockers....also you could try Gessford or even Comp Cams, as they are the same piece.

It's hard to say what would cause it...it could be a weak pushrod or maybe the adjuster broke first.

How's the valve stem look? Also, is the rocker shaft bent? Stands broken?