How would you go about doing this?

I feel your pain
I've had a tick in my motor since day 1.... comes and goes...gets louder then quieter... changed cams twice and lifter 3 times...Hughes roller rockers ...Smith bros. pushrods... It's really Annoying ! Motor runs like a scalded cat....urgh.....

Yea, this one changes a little once in awhile and is pretty much gone completely other times.