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any ideas?

I'd say during a hard stop the pickup is being uncovered & causing a momentary loss of psi & hence the lifter clatter. If you're saying that at other times the lifters are clattering briefly and randomly, I had that & psi was good, it was a lifter problem. Not to worry though on next teardown I would R&R the lifters & rebreak in the cam & add baffles if your hipo pan is not so equipped.

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