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A leakdown won't tell you if it's the seals. Compression test is "fine," what does that mean? Anything less than 220 or more than a 5psi difference in cylinders and I wouldn't rule out the rings.
Valve seal leakage is usually manifested as oil consumption during high vacuum- lift throttle on decelleration, etc.
Valve seals are normally easy to replace, but nothing is easy in an H22. I don't think it would be possible to replace the valve seals in an H22 with the head on the block, I haven't seen a tool yet that will get in there to remove the valve springs with the head on. Not sure if Honda makes something to do it or not. You might be able to fabricate something, but it would be a LOT easier to just remove the head.
Also, valve seals on Hondas are usually good for 10 years or 150k miles.
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