For you guys painting your engines, prep prep prep, that's the secret. That means, clean the dirt and oil from every nook and cranny like your life depends on it. It never hurts to give your paint a "tooth" to grip onto. That means a once over with scotchbrite or fine sandpaper won't hurt. Tape everything off that you don't want painted. Tape tape tape.
Besides the motor, painting the H-box makes a big improvement in looks.
Are you fellows going for a factory silver? A few members on this forum have had the courage to go with a different engine color and I think the results were really fantastic. Sadly, I don't have such "color" courage and thus, ride vicariously through those few, courageous chaps.