Think he is talking about custom pushrods that have a smaller feed passage/hole to the rocker arm. You can order them drilled to different diameters and they become the restrictor vs taping and installing a restrictor in the lifter passage.
Hope that helps.
Tom Vaught
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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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