Years ago, the Pontiac RAM AIR IV lifters used a special "thick" pushrod cup that reduced the plunger travel distance. I believe the extra thickness of the RA-IV pushrod cup was .100" so the plunger travel was reduced .100" by the design of the parts.
Maybe others can add to that design information.
The Rhoads VMAX lifters seem to work very well if adjusted properly.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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