tapping noise

Quickstop [UK]

Combating adversyty.
there is a steady tapping noise coming from the engine under the intercooler/ air intake for the engine.

Is this tappet rattle? It can be heard outside the hood and is rhythmic. It does not sound too loud but is noticeable.

Implications if any?

Are the tappet valves automatically adjustable or do I need to take the rocker covers off and adjust it all?

thanks again
 
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