Lifter Clatter

The clattering makes sense for the idea of bleeding down. But that won't hang the valves open... it'll do the opposite. What oil is being used?

'63GT said

But I suspect you may be having some pressure issues.. Even just a slight amount of cavitation will severely compromise a Hyd lifter under power.

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If they pump right up after sitting a bit, that that idea is making some sense.