Is there any sealant used on the washers and/or nuts that go on the lower head studs to prevent leakage? As I type this in my office, I can't recall if that is covered in Jake's video. I have Curil T and Curil K2 sealants.

Use Curil T in this location.

What are lower head nuts?

Should I be using this on my cylinder to case mating point?

Thanks.

The lower head nuts are the nuts that secure the head to the case, the lower ones being the four that are under the valve cover.

Fair enough. Do you use the curil on the upper, exposed ones too?