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Marginal oil pressure

Engine

Model: 911S, Year:1973, Mileage:200K, Type of use:Street use only
I have a 2.4 MFI 911S that is stock except for the addition of pressure fed chain tensioners. Do the chain tensioners consume enough oil to impact the running oil pressure? I am using 20W50 oil and just barely get 60 psi at 5 Krpm and 180 F. Pressure is considerably less at lower rpms. I believe teh car has 200 Kmiles, and the engine was rebuilt at 100 Kmiles.

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