[BillH]

I removed the intake and valve covers from my car. Took them to the local machine shop and had them cleaned and glass beaded. After polishing the tops of the valve cover fins, I coated everything with Zoop seal. This was two years ago. All I have to do is hit it with a hose and everything comes clean. Zoop seal is not cheap but it's the only thing I have used that will seal rough cast aluminum and prevent it from absorbing dirt.