Water trapped in block

[jmc <jmc987@earthlink.net>]

My radiator is new & the block is flushed clean. I removed the heater 
hose and flushed the heater seperately. But I can't undo the block drain. 
Could I spin the engine (with the coil disconnected) and let the water 
pump expel the rest of the water or should I just live with the tap water 
trapped inside the block. Thanks in advance.

Joseph 
67 B Roadster
(with a drain plug instead of a valve)