Clicking noise in engine during idle

The correct valve lash setting is: intakes,.010 to .012. Exhaust: 014 to .015 I assume you are using adjustable lifters. If they were not locked properly after adjustment, that could be your problem. We always replace all valve springs because they can take a "set" when older. One weak spring can allow the "tic". When we ground valves years ago, including the stems, it always seemed to create a ticking sound when one or more if we cut the stem a bit too much. As to the removal of the pump rod, it is better to leave it in place because the bushing will allow an internal oil leak. The pump rod rides on the camshaft and the hole extends into the camshaft oil gallery.
 
I bought adjustable lifters and new springs when I rebuilt it 3000 miles ago.
New development: just pulled the cam and all 16 lifters and the lifter on the exhaust valve on the 2nd cyl. On the drivers side has a divot worn in the cam surface on the lifter perhaps .030 deep and slightly off center. Cam lobe is marred but still mics same as other lobes. Going to the machine shop tomorrow with the cam and lifter to see if he can shed any light. The cam is a mild 3/4 from Isky.
 
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