Back in the early 90's during my dirt track days we left the valve seals off on purpose to get a little extra lube on the top end of the motor... upon start-up, we would get one good puff of blue smoke that never lasted more than 30 seconds......similar thing happened with my road race motor last year, in a hurry to re-assemble it, found they sent me the wrong valve seals, so I put it together without the seals, smoke never lasted more than 30 seconds and wasn't all that much to begin with......after that you didn't see any smoke during normal running nor racing....
Oil consumption was very little, not enough to worry about bewteen changes, probably less than 1/2 quart.........
3+ minutes is too long and would suggest something else as the problem as would all the plugs looking the same with some
oil useage on all of them....
Next guess would be PCV or possibly some
oil coming from poorly baffled valve cover PCV and/or breather?????
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I'd do a leakdown and a pressure test.
Today 01:25 AM
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Defintely should be your next step.........also try running it with the PCV removed....try the easy and simple things first....
It's sucking oil from somewhere and with the plugs all looking about the same,that would point to getting oil into the intake and going into all cylinders.
I'm kinda stumped with this one, if the rings didn't seat, you should see some blue smoke pretty much all the time, and using a quart of oil every 1000 miles would make it smoke more than just 3 minutes after start up....
David