why is the center of that 440 that color?
To seal any residual gunk and debris from hot tanking and grinding the slag off of the lifter valley getting into the oil and supposedly aids oil return a little.
I can't remember the proper name of that sealer now but is has been used for a lot of years to do that
I'm going to say it is a Smokey Yunick and Grumpy Jekins trick originally, I don't have a clue who they pick that up from
I use Rust Oleum Damp Proof red primer to seal my motors, have for years and years with no issues