My father in-law serviced P-38's during WWII and he would take the plane and run it up to temp and then start sprayiin Marvelous Mystery Oil into the intake, and when the exhaust started to run dark, he would shut the engine off and let it sit over night. He would then go out it the morning and start the engine and run it up to speed and blow it out. He said it would clean up stuck rings and valves and give the plane another lease on life. I have done this on my cars and it made a differenece and never did any damage.

I am confused bythis post though. Give the results on the compression test and get the engine model. I am confused by your reference to the valves not being in a row.

I would not take the head off unless you have abeeter idea of what is wrong. If you have a stuck ring, youwill need to pull the engine and remove the pistons. Removing the head won't tell youmuch.

Henry

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