checking valve clearance

[QuantumMotorsports]

Hey guys, I was thinking of doing this instead of using a solid lifter like a couple of posts have said to do. While checking valve clearance with clay, instead of putting checking springs on or replacing a lifter with one that has been modified to not compress, I was thinking of having a friend use a drill to turn the oil pump. You think this would keep the oil pressure in the lifter high enough so that it would not bleed down? I figure that way the engine will be well lubed, don't have to remove springs, don't have to modify a lifter to work, unless you guys can come up with a reason not to. Only thing I can think of is it would be kinda messy. I'd have to put a valve cover on the side i was testing. Or actually, now that I think about it, I'd have to put all of the lifters in and it might just blow them right out of the lifter bores. what do you think?