Hydraulic to solid lifter camshaft

So I'm a little confused, I was always under the assumption that moving to a solid lifter camshaft on a hydraulic la motor (340) required restricting oil flow via peening or bushing lifter bores. Am I wrong? lately I was told that no oiling modifications or changes need to be made. I know there are threads going into oiling improvements but my question is yes or no can you convert a 340 to solid lifters without modifications and without sacrificing oil pressure to the bottom end.