Like everything on this project the leak test is confusing. For sure there is a leak, the pressure bleeds down 1 psi per minute at 30psi, and maybe 1/2 that at 15 psi so 30 to 0 is about an hour.
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Also for sure the leak is not into the cylinders. I have gapless rings that should seal so I used a compression tester hose to make a bubble tester and nothing, not even a hint of of air flowing in any of the cylinders. When I was actually running the test and not trying to photo it, I held the tip of the hose about 1/8" in the water, so there is no even 0.125" water pressure (0.005psi) in there.
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With everything off in the shop, I can't hear anything.....no idea where it's leaking.
When I went to install the second head I realized I screwed up a little on the 1st. I put sealer on the coolant flow passages on the block but the head has more holes....so where the circles are there are no holes in the block for coolant flow but the head gasket does seal of holes in the heads.....that could be a leak. I'm pretty sure if I pull the head with sealer on it the gasket will be destroyed....and that may or may not be the leak.
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I googled how to leak test a cooling system and found 15 psi for 2 minutes with the coolant full....if its only losing 1/2 psi/ minute of air at 15psi, so that would be 1/50th of that with water or about 0.02psi in 2 minutes and would easily pass. another source said 15 minutes....I'd lose about 0.15 psi in that test test and again pass so I'm leaking toward saying its good enough......
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