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When I had such a problem, it was the thrust bearing going. It didn't knock if I held the clutch pedal down--that's the telltale. After about 20-30 seconds it went away, I guess when enough oil got splashed up on the bearing. I tried a lot of different oils and way over-greased the throwout bearing during the denial phase.
I have the A-FOrd-able full flow filter, but don't think it has anything to do with the problem, since the thrust relies on splash, I believe. It took about 5000 miles for knock to start and another 5000 before I did anything about it. Got about 5000 miles on the rebuild and so far it's ok, in that regard anyhow.
Steve