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Regardless of what the book says what oil pressure does a ‘26-’27 standard 6 really produce at idle on a hot engine?  

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If you have seven to ten it will be okay. Less than that and you should drop the pan and look at things. Pay particular attention to the soldered joints of the oil plumbing and cleanliness of the pan and oil pump screen. I made a device to pressurize the oiling system with the pan off. It’s messy but makes it easy to see where your pressure is leaking off.

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What RPM are you running at idle.  You can really turn the engine speed down on these with the low compression engines.  Mine will just lope.   I need to put a tachometer on it, but it could be idling as low as 300 rpm and it registers almost nothing.   At speed I am at almost 30 PSIG.  

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