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Message: [QUOTE="Gary, post: 951256, member: 675"] I use to build prototype engines and work in the dyno labs at Ford and that's the way we did it when it was first build and when we tore them down after durability testing for inspection. Then to test head gaskets we put 1000 psi of nitrogen in the cylinder and look for bubbles in the coolant. Now when I'm looking for a hole in a cylinder wall, I pull the crank, rods and pistons out, bolt the heads back down with fresh gaskets. Then I block off the water pump inlet, heater hose nipples, and I made cap for the upper hose with a schrader valve, then fill the system with water and put the air pressure to it. I have had some blocks that needed 100 psi and I had to heat the block with a rose bud to get them to leak. Usually them old 6.9's and 7.3's it was #8 everytime [/QUOTE]

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