Testing valve seal after lapping valves on the cylinder head

So I just got done lapping all the intake and exhaust valves and I was wondering if anyone knows of a test to test the seal before installing everything. I got all the valves back in and the springs on the valves. I put in the spark plugs turned the cylinder head upside down and filled each cylinder head with water. After 24 hours I came back and the water leaked through every valve. Do you think this means I didn't lap the valves correctly?

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Here is a photo

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I saw water laying in all the exhaust and intake ports after 24 hours. I used lapping compound and a lapping tool and hand spun the valves. Being my first time doing this... There is a good chance I didn't lap the valves correctly.

When I was cleaning the cylinder head, I did put it on its side and the intake ports held water, but cylinder 1 and 3 on the exhaust side leaked.

I'll try putting it on its side again and fill with water to see what happens before I take the springs off again. Sigh... Putting the retaining keepers on are a serious PITA.

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I ended up ordering more fine paste to do the lapping with 400, 600, 1050 grit paste.

FYI, don't use the water method... When I took it all back apart, water deposits and rust started to show and ruin all the work I did.

I created a vacuum tester to see what kind of seal I could get. And after using the finer grits it was so much better. I couldn't get the seal I was looking for until I installed the valve springs, but with that vacuum tool I know the valves are no longer an issue.

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