I'm about ready to send my first sample to Blackstone and I'm confused about what to put for:
Engine Make
Engine Model
I have a 2008 Chevy Silverado 5.3L
I would put 2008 Chevy in the first line and Silverado 5.3L in the second line, but it doesn't really matter. As long as you put all that information there somewhere, they'll figure it out.
Despite Blackstone making occasional dumb comments in their UOA interpretations, they ought to have some level of common sense.