I did a non-running adjustment on all rocker arms and I still get this nasty noise ... I believe it comes from the forward-most piston.<br />This is a distinct, sharp noise... not a dull, thunking sound and it comes from the top/front of the engine (not down deep in the engine). I feel certain it is one of the two front pushrods but do not want to tighten too far????????<br />My big concern is over-tightening. If I over-tighten 1/2 a turn will that cause real damage?<br />Also, how can I determine which pushrod is noisey? It is not possible with the engine running?<br />Thanks,<br />skiph