An easy way to pressure-test a block is to bolt a bare cylinder head onto the block, and plug the water passages from the head to the intake front and rear with small steel or aluminum plates bolted onto the head. Then adapt a garden hose to the water pump hole of that side of the block with another flat plate. Turn on the hose, and look for leaks. You can do it one side at a time- - - -there's no water passage from side to side. I test blocks and heads that way pretty often.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!