Well, for once, persistence paid off.

After reading the archives, I suspected that the check valves in the oil filter canister had failed, and were allowing the oil to drain out of the canister after sitting for a while (> 8 hours).

So, I decided to replace the oil filter canister with a salvage canister.

Unfortunately, it didn't work. I still had slow oil pressure build-up.

I then suspected that I might have a "weak" oil pump. The thought of replacing the oil pump sent shivers up and down my spine, so I decided to try another, different oil filter canister first.

I had my eye on Bruno's new home made oil filter canister kit.

But, being the slow learner that I am, I ordered another salvage canister - this time from Vines. This one showed up with no check valves at all!!! They were rotted/corroded out of the canister. Yuck. Vines was understanding, and offered to send a replacement.

Guess what?

It worked!!!

My slow oil pressure build up (on start up) problem is solved.

Thanks to all of the very helpful advice that I received here.

Erick