[37 Coupe]

I have a new radiator on order for my '31 and do not want to plugged it up right off the bat from the gunky red rust crap I see after removing the head. I was thinking about some sort of solution to just pour in the water jackets and let it soak,like the beet juice or acetone and automatic trans fluid,obviousy stuff like Kroil would cost hundreds. I may try the vinegar flush,whatever I use I want to not harm the engine.