How do you clean water passages?

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Posted by Don in Missouri on Wednesday, August 11, 2004 at 10:53AM :

I've been told my local machine shops no longer "boil out" engine blocks. They put them in a spray tank to remove the external dirt, but that doesn't do anything to get rust scale out of the water passages.

I have disassembled a couple flatheads I want to overhaul. How can I clean the water passages beyond removing all the freeze plugs and scraping with a screwdriver? Does anyone know of shops that offer a block cleaning service? Are there chemical solutions I can put in there? If I devise a skinny, hooked nozzle for a sandlblaster, will that clean it or just fill it with sand?

Anybody know where I can find valve guides for a '39 Chrysler eight cylinder?

I have found all the other engine parts at Terrill Machine in Deleon, TX. They have great prices on six-cylinder parts, too. 254-893-2610


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