Steve,

I wouldn't worry so much about the compression readings as long as the car idles and runs well warm.The cyl with 170 may be pushing some oil. Find a good shop to diagnose your problem. There are too many possibilities to do on the internet.Again by the way to even out those comp readings will cost more than the car is worth. Put that money into a new heater box to correct those jammed heater levers you are experiencing.

Good luck,
Peter

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