420A Removing rust and corrosion off a 420a block

[wyv344]

Does anyone a way to remove surface rust and corrosion of a 420a block? I'm considering soaking it in CLR mixed with hot water and letting it soak for a couple days.

 

[Dericsh]

sounds like a good start. I’ve seen people recommend oven cleaner as well.

 

[wyv344]

sounds like a good start. I’ve seen people recommend oven cleaner as well.

I'd never think of using oven cleaner on a engine block

 

[BLACK'98DSM]

I typically have my machine shop do it through the hot tank process.

To do it myself I would probably use a wire wheel on a power drill. If it's bad, soak it in penetrating oil for a day or two first. There are different material wire wheels. Use a brass alloy composition to knock off mild rust. Or a steel composition to remove old paint/heavy rust.

Make sure you replace those freeze plugs too!