anyone know what this involves and what it means,

have good compression, adjusted valve lash

whats involved in reseating

anyone got a link?

We still don't know what you mean by "reseating" the valves. What exactly is it that you have in mind?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

If you mean remachining or replacing the valve seats, that's a job for a machine shop.
You might be able to get the valves to seal a bit better by lapping the valves and seats. This involves head disassembly, valve grinding compound, a means of turning the valves, and time.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO