Quote:

Top --> .004 = .018"; .0045 = .020"
2nd --> .005 = .022"; .0055 = .024"

Guidance requested.

My 2-cents. There isn't really anything significant to gain with tight ring gaps. It should be fine either way, but for high heat insurance, I would go about:

Top: 0.019-0.020"
2nd: 0.022-0.023"

My engine (higher CR, hp, etc) is 0.021", and 0.024" as I recall.