I've been sorting out little mechanical issues on my recently aquired cj2a and finally have been doing a little driving. I've noticed oil pressure is good on cold start up and remains good (between 40 and 60 psi) during driving, however, when the engine is up to temp and allowed to idle the pressure drops to about 5 lbs. Does this sound like my engine bearing clearances are too wide, or is that still acceptable for these old flatheads?