Can't really see the oil level rising, maybe my fault or I need new glasses.

It'd be a good test for a Hemi, given the internet folklore of "each valve cover holds a gallon of oil at high rpm" or whatever it is this week.

Dave V. sent me some valve covers that are too wide to fit most passenger vehicles, but would work on a dyno, and are nice and flat for
opening up and creating a couple picture windows, above and below the spark plugs for a similar test. Hmm, maybe they'd be good for that type of project.