Paint Engine

[astroracer]

You can do this yourself. It is a LOT of work if you want the paint to last. If you go at it half-assed the paint will peel and look as bad as the oxidized block.
You need to scrub this thing with tooth brushes, ScotchBrite and Simple Green. Scrub it until it is spotless. THEN wipe it down with lacquer thinner to remove all of the Simple Green. You have to get into ALL of the corners and nooks and crannies otherwise the paint will not stick and it will start to peel out of the crevices. Next wipe it down very well with a good degreaser like Prep-Sol or Pre-Kleeno.
Mask off whatever you don't need painted and spray the engine with a good self-etching primer. DuPont sells it and so does Eastwood.
Once it is primed you can spray whatever paint on it you want. Engines don't get hot enough to required "hi-temp" paint other then on the exhaust ports. Don't worry about those, just paint 'em.
Mark