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TimeBus from the Land Rover Forum, posted this thread today and I and borrowing it from him so you can all read this.
RPi Engineering - V8 Engines
 

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Buy some small block Buick lifters to start with on a rebuild. Specify oil through push rod or no metered oiling . Get a dial indicator and measure total deflection with NO oil in the lifter. This can be done on the top of the rocker arm. From the top of the retainer clip I go down .030 to minimize lifter pump up at high RPM's.

A better alternative is a shaft mount system that is adjustable I engineered. Buying new shaft assemblies on a rebuild is not cost effective if you are at that point. I have seen unacceptable wear and clogged oil passages on the shaft mount where oil is fed through.

This is simple mechanics 101.

MAK
 

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