The Ford Barn

Merc Cruzer · 11-28-2010, 10:08 AM

I have a 53' Merc Flathead block that has been dipped and magnafluxed - no cracks. I have been doing the long screwdriver and brushes in the water jackets, but want the water jackets cleaner. I am going to bolt the heads back on the block with old head gaskets, stand it up and then fill the water jackets, let it stand and the flush them out. From the past posts, the options are:

Phosphoric Prep and Etch from the Home Depot
Evapo-rust
Molasses (which by the way I cannot find locally)
Oxalic acid crystals (aka. Wood bleach in hardware stores)
Vinegar

....thoughts on which one would be the best for this project.

11-28-2010, 10:08 AM	#1
Merc Cruzer Senior Member Join Date: Jul 2010 Location: Conifer, Colorado Posts: 2,518	Rust removal in the water jackets I have a 53' Merc Flathead block that has been dipped and magnafluxed - no cracks. I have been doing the long screwdriver and brushes in the water jackets, but want the water jackets cleaner. I am going to bolt the heads back on the block with old head gaskets, stand it up and then fill the water jackets, let it stand and the flush them out. From the past posts, the options are: Phosphoric Prep and Etch from the Home Depot Evapo-rust Molasses (which by the way I cannot find locally) Oxalic acid crystals (aka. Wood bleach in hardware stores) Vinegar ....thoughts on which one would be the best for this project.