shimming hydraulic roller lifters solid

[1] The pressure oiling to the rollers in a roller lifter is a marketing gimmick [ like MSD multi spark ] . It is an engineering FACT that ball & roller brgs survive on very minimal oiling. Some examples: wheel brgs, U joints, alt brgs. The lifters get plenty of oil slung off the crank & from the lifter bores.
Multi spark. I have read that when MSD [ Autronics, El Paso ] in conjunction with Chrys engineered the CD ign, it misfired at low rpms. That is because CD ign has a spark duration about 1/10th that of inductive ign, & at low rpms a long duration spark is needed. Some bright spark [ pardon the pun ] said: 'We will make it multi spark at low rpms'. So an engineering failure was turned into success with marketing hype.
[2] Both hyd & sol lifter lobes have clearance ramps to take up the clearance. Because the hyd cam has a hyd cushion, the ramps are shorter than a sol lifter lobe.
[3] Running solid lifters on a hyd cam has been done many times, including by myself. Zero problems as long as hot lash is kept tight. The effective duration [ & lift ] of the cam will be slightly shorter using solid lifters, but the idle & vacuum will be better. Whether a loss of performance occurs because of this will depend on the parts.