Hello, the rings seamed serviceable to me.
Top ring was chromed and marked "s"
Second ring was marked "T"
Oil rings were the rail type.
I have fitted them with the markings facing up.

An example of the ring end gap, second ring 0.008".

Valves lapped and clearances set as per GXV120 Specs. 0.006" IN and 0.008" EX
Piston fitted with arrow facing the push rods.
Timing marks on the gears clear to see.

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Below is the breather type on the Pope and Scott Bonner engines.
If these types of valves leak I have flipped them over in the past.
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Happy is he who penetrates the mystery of things.