paint motor with a brush?
I painted my last engine I built with a brush and used POR engine paint .
It was great and easy to put on , and you could apply extra paint easily where you needed it .
And you didn't have to mask anything off or worry about overspray.
I would definitely do it that way again.
Here is the engine in question
http://www.forabodiesonly.com/mopar/vbpicgallery.php?do=big&p=29714#photo