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So, if they are solid - they need to be replaced IMHO.
*I now believe this may be partially wrong based on dismantling many old M96 lifters. Sometimes the tappet assembly is solid in the bucket because the tappet and the bucket is full of oil.
Proof = Dismantle all the Lifter parts,and carefully reassemble with no oil - the two halves of the tappet move freely. Install the tappet in the bucket WITHOUT the retaining ring - everything still moves freely. Install the retaining ring - ditto. Fill the tappet and the bucket with oil and reassemble completely - Rock Solid to finger pressure.
But remeber ,the lifter will only stay "rock solid"to any degree if the engine oil pressure is sufficient.If the Lifter carrier bores or cam bearings are worn -not so much ? *
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