PhillipM
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I thought the Rover V8 had hydraulic tappets so was self adjusting?
You still need the right clearances on the pushrods otherwise the expansion holds the valves open after the engine warms up for a few minutes. Had a friend with one with that exact problem not too long ago - engine had the heads skimmed down heavily.
Preload settings are in the Haynes IIRC, worth a check if you find nothing with the carb or ignition side.