Lifter bleed-down is normal. All hydraulic lifter engines do it. If there's enough bearing wear and/or other clearance issues that result in low oil pressure, sometimes it takes a little while for the lifters to pump up and stop rattling after sitting for several hours.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!