i have lifter noise only when starting engine .Why on 2006 Dodge Ram 1500

OIl pick up was replaced as well as one lifter from left bank. Right bank is now noisy but only @ start up

Asked by for the 2006 Dodge Ram 1500
Drain ALL oil out of engine and remove filter. Start engine and see if the noise evens out on both sides after 20 seconds. Then replace filter and add oil to proper level and see if noise is gone.