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· More for Less Racer
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Yeah, no problems until you bottom out the plunger.

Used to be a circle track trick to run flat hydro lifters just a hair off of bottomed out, so that oil aeration or lack of time to refill caused them to collapse and the engine wouldn't lose a ton of power.
Problem comes if you run it that way into valve float and the lifter pumps up, valves get held off the seat a lot farther and risk getting struck by the piston and bent during overlap.
 
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