With .020 clearance it will be slightly noisy.
.020 is really not all that much as some of the old chevy solid lifter engines ran as much as .030 with no ill effects.
The valves on those twins have no easy adjustment.
To decrease clearance you have to seat the valve deeper into the head, or replace the valve.
To increase the clearance, the valve stems need to be ground.
Best to run it till it needs to come apart for rings/overhaul.
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