Tapping Noise sounds like lifters

For 1988 350 chevey. Replaced lifters and pushrods. Adjusted cold per manual. Till friction and then 3/4 turn. Have noise loudest at start up and quites down after about 5 min. Tried tightening each one while running 1 turn and even loosen 1/2 turn with no change in noise. Any answers appriciated. Thanks.