Ok. Well. Bad news--one of the cylinders is checking in at just over 200psi.

Not sure if it's rings or valves...

So...short of rebuilding the engine, or buying a rebuilt 603...what can I try? I am short on time AND money for the next six months--building an addition on the house.

Soak the cylinders with MMO?

Mist some water into the intake tube while running?

Add some Sea Foam to the crank case oil?

Any thoughts appreciated.

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1991 350 SD run on WVO
2001 Excursion run on B100