engine noise

When each lifter is on its base aka not on the lobe, you need to compare distance between the snap ring and the plunger, (the push rod is pushing on). there should be about .040 between the snap ring and the plunger. more importance is that the distance should be all the same distance when the cam is not on the lobe.

IF the plunger in the lifter is all the way up to the snap ring this could cause your noise. if you can easy compress the lifter or the plunger in the lifter with finger pressure, the lifter need to be replaced.

If its at the snap ring look at cam lobe for damage. if the plunger is all the way down into the lifter body, you need a smaller push rod.