Big Block ticking? Flat tappet cam. Normal?

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Stock VW 1600 cc engines valve lash is set at .004 - .006 ths. Aluminum Heads, solid lifters and adjustable rockers.

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If these were all new parts that were just getting aquainted with each other, then stack of tolerances could account for a 3-4 thou change without anything failing. More noticeable with 1.6 rockers.
 
or the fact that cold in January vs June makes a difference
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I wouldn’t rule that out.

To see if the lash is holding steady, the before/after checks should be at least at “similar” air/engine temps.
 
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