... it's not supposed to flow oil fast. the checkvalve resists oil flow. only drops at a time should collect in the can, so oil should trickle into the block.
I don't think I'd apply pressure to the checkvalve... I'd hate to damage it and have oil suck into the intake...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!