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Drop in compression M20C

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Drop in compression M20

I just checked out a 1966 M20C for possible purchase. I noticed a drop in compression in #3 over the last 3 years as reading 73, 70 this 60 this year. This really caught my eye. The engine has right around 1500 TSOH. The others are steady in the mid to low 70s. The seller and I talked about it and was told he had it scoped and was willing to offer pics. This however doesn't correct the drop in compression. We both believe its a dirty exhaust valve that can be corrected with a cleaning and
egarcia77035

egarcia77035

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