lifters cannot be purged even by oil pressure? I've heard that some lifters cannot purge themselves of air. I submerged a squishy lifter in oil overnight but it did not purge itself. I also manually actuated it for a couple minutes in the oil, yet it still did not purge itself of air. I don't know if these lifters are air-purge capable or not. If someone does, that would be a hugely important insight!
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