1952 8n oil pressure

(quoted from post at 21:22:50 01/31/19) Hello, we have recently installed a used engine in our 1952 8n that we overhauled with a rebuild kit (pistons/sleeves, rod bearings ect..), the engine is running well and the oil pressure is at approx. 40 psi when at idle, the problem we are having is it takes longer than it should to get oil pressure upon start up, hard to put an exact number on it but maybe 20 seconds? Once running it will maintain pressure when in use just fine but it is the delay on start up that is concerning, is there any common known cause of this, one thought would be if the oil filter housing is draining and needs to filled when started but am not certain if there is a check valve or anything to address that or not. Thank you for any info. on this concern

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(quoted from post at 22:39:40 01/31/19) no knocking noise when starting or running and hold oil pressure great when in use, but when comparing it to my 2n there is a noticeable difference when oil pressure arrives, we are running 30 weight engine oil

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(quoted from post at 13:16:44 02/01/19) Tim just might have hit on something. How long does it take to get oil pressure up to say, 20-25 psi? Perhaps your oil pressure relief spring is too stiff.

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