The lifter assembly is held together by a snap ring. Below the pushrod seat is the plunger and spring.
before we all get out of hand here. Lets also check the pushrods to see if one isn't slightly bent, or maybe a rocker bearing isn't bad. All of that can cause the infamous valve tick.
Just remember the pushrods are two different lengths. You can roll the cleaned pushrods across a sheet of glass to see if they're straight, so that's an easy check.
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