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compression

Engine

Model: 911sc, Year:1978, Mileage:175,00, Type of use:Street use only
I recently bought a 78SC with 175k miles on the clock. Engine was rebuilt about 50k miles ago by a professional shop. Car pulls really hard and runs great. Just curious though. When I did the compression test on my PPI the readings were between 145-150 PSI on all cylinders. (Consistent) Is this good? What should the readings be in a perfect world. ThxChris

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