To piggy-back on this post... I'm going through a rebuild in my 560 and I'm about to be putting my lifters back in. I bagged all the lifters, rockers, plates (between the rocker and the spring) so that I can put them back where they were. I've kepts the lifters separate and upright, yet organized. How can I test them to make sure they're good before I put them back in?

I ask becuase I had .05" to .1" of black cakelike sludge below each one of them when I removed them from the head. The heads have been cleaned/machined and look like new now.