Tom, my 8V92 and most of the 8V92's I have seen are running a 7 psi radiator cap. I hope someone from Newell will chime in here but I know that either a 7 or a 9 psi is what Detroit Diesel recommended at the time for the 8V92 per the service manual. As a matter of fact Detroit Diesel recommends that even in pressure testing the engine you should not exceed 20 psi.
I have not seen an early 90's Newell with an external overflow tank on it although I am sure someone has done it. I find that if I fill the tank to the center of the sightglass when the coolant is cold, I rarely have to add coolant. If I try filling it higher than that it seems to puke out more coolant so that it drops well below the bottom of the sightglass.
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