Putting our 440 back together after a spun rod bearing, (pig rich idle causing pre-ignition!)

Crank now .010 under rods, new bearings on lower end, new head gaskets.

Started engine to look for leaks and adjust idle and heard a rocker tick.
Pulled covers and found # 6 intake rocker (Hughes roller, hydraulic .484 cam) with too much clearance. Adjusters tight and the same amt. of threads showing as the others??

This was the cylinder that spun the bearing so I pulled the rocker shaft to see if the rocker had unusual wear showing, also pulled the lifter out to look for face wear, every thing looked normal, lifter face looked great with good convex still apparent, cam lobe too.

so I proceeded to reset that rocker's preload and now I have questions
about lifter pump-up when setting.

Does it matter if lifter is still "solid" when setting preload?
Will one full turn of adjuster still be correct as Hughes recommends?

New head gaskets, so maybe some variance there, but why #6 only??

Thanks, Joe