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make sure to disconnect the crankcase vent tube for pressure testing.
I would also remove the dip stick and oil cap. Maybe just loosen the oil cap at least.
If you accidentally pressurize the crankcase in the process you could blow out the oil seals.
Also during the pressure test, you can listen to the dipstick and oil cap hole to hear air leaking past the piston rings (like a pseudo leak down test)
this is also a great time to test the pcv valve and I would also replace it (replace and make sure the new one works)
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