1987 Ford Mustang Gt
Thank you so much for the details and information. It was really helpful in understanding what I should be expecting by running this test.Forgot to mention, if compression is leaking into the coolant you may hear air bubbling in the coolant ports of the heads.
I quickly went out and tried this out on cylinders 1 to 3. I made sure that I got the cylinders on TDC on the compression stroke. When running the tests on these cylinders I heard the air hissing in the crankcase around the distributor. For cylinder 3, I noticed it coming from the dipstick. Once I get more time I will redo the tests.