1972 Wagon, 2000cc, 58,000 mi. Compression tested 150 lb. for 3 cylinders, and it "pumped up" to 120 lb. on the 4th cylinder. Someone told me since the car has not run in 2 yrs., and that it was a "summer car" and put up in the winters all its life, that it may only be a stuck ring, and I should squirt oil in the offending cylinder, let is sit, then drive it and hope that the ring frees up.
Of course it might be a valve. If it is a valve, and I have the valves done, do I need to have "updated" valve seats installed in the head since gas is now all unleaded?
Can I hurt it by driving it with the low compression in one cylinder? Thanks, jt