Or just run closed cooling and problem solved, never have to worry about your aluminum heads and salt ever.

Is there a company i send the rhs heads to and get them hard anodized? thanks

Many plating companies offer hard anodizing services, but would be tough with heads that already have guides and seats installed. It's basically a 'dunking' process.

Be forewarned, hard anodizng also makes the aluminum surface very 'hard.' Machining / grinding / porting / etc a hard anodized surface is very tough.

Last warning, it makes aluminum 'electrically dead.' Make sure to leave an accesory bolt hole or two or all unanodized so that you can ground your heads. I would also suggest to keep the spark plugs threads unanodized too as your plugs need a good ground.

We want the heads to be protected from water/electrolysis but we do not want our ground paths gone.

So it sounds like a process that ideally should be done to a raw casting, before any machining takes place, right? Do they do this prior to milling the deck surfaces and cutting for guides and seats? Before the ports are CNC ported?

If you are running in salt go with closed system...everything else you are just pissing in the wind...

They do it different from each other. Canfield used to do it after all machining. AFR does it before the decks and such. I don't know about Dart.

Again, they call this anodizing 'Hard Anodizing' for a reason. It makes the surface very 'hard' and not to kind to cutters, burs, and etc.

Thanks everyone for your response. Anyone else used rhs heads with great success power wise.