5.9 & a solid roller

I've put about 300 miles on mine so far with the same oiling setup as Toluene56, haven't pulled the valve covers to check the valvetrain but it runs great. Almost no valvetrain noise either, and oil pressure at hot idle is a hair under 20psi with a regular-volume oil pump. Part of the reason is I'm running pretty thick oil but I still don't think an HV pump is totally necessary.