Originally Posted By Cab_Burge
You can bolt it together with the heads and put a pressure inlet port and gauge on block plates on the water pump inlet and outlets(both sides) and apply air pressure and get a spray bottle of soapy water and go searching all over the heads and block scope
I've used a torque plate to pressure check aluminum heads that had been welded on, that works also up

So you use air instead of water? At what pressure? Would an engine "see" 20# or more pressure running?