Rattle in 6.6 on startup

[Bill bent]

Have a 2003 2500 HD 6.6 and when you start it it makes a rattling noise for half a second and if it sits for a few days it will rattle for a full second or more. Is that normal or is that the bearings in the motor? Truck is new to me. 270k on truck. Can I just put bearings in lower end?

 

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[Chopper_Man]

lifter bleeding down over night

 

[Bill bent]

lifter bleeding down over night

Maybe