Bumping this back up.....

Indcontrols....What type of device for water pressure. Like a deck pressure washer or ? And how long was this process.

Rebel....How long was it before you saw any results. I have a place that can hot tank it. Do you think that would do it over the course of a few weeks...or ?

Thanks in advance for all the help.

5-6 months. if its going to work you should see something in the water in a few weeks

That's new to me, I have used MA for years on all types of steel-cast iron, never saw any metal removed, what looked like metal removed was what the rust had allready eaten. Always use outside keep in closed container.
For the OP, put a few drops in there and see what happens, never know unless tried.

I wonder if soaking in vinegar would break it down?

Well, if not at least it will be pickled.

Muriatic acid is also known as hydrochloric acid, it's what helps digest your food in your stomach.

Scare stories aside, it can be rinsed out of a block and it is used to clean scale out of a block, this is quite common. Of course if the block in question has a rusty pinhole, the acid will find it.

It is used to etch concrete. It reacts with the alkaline based cement. Will it work on block filler is a good question and depends on what the block filler is primarily made of.

The factors for metal removal are concentration, time and temperature. Increase any of them and metal removal increases.

R.

If the acid didn't at least eat away enough filler in a certain time frame (before the block started to significantly suffer), it might be hard to rinse and neutralize acid that found its way into deeper voids between the filler and block.

If I had the block and seriously wanted to find out I would try to remove a sample piece of the filler and do some testing outside the block.

So, what is the end of the story? Did you get the filler out or buy the block or just build the engine?????

I have a buddy that has a 455 Pontiac block 3/4 filled and drives it on the street all of the time. It runs cooler than any of my Mopars every have.

Water temp will be cooler...common for a filled block. But I bet the oil temp is up there.

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Water temp will be cooler...common for a filled block. But I bet the oil temp is up there. [/quote]


Exactly, my Hemi is filled and it runs cool but after driving around and sitting in any traffic, the thing is just huffing oil out of the valve cover breathers.

My half fill 528 will sit in traffic all day in summer but gets up a bit on the highway

a vibratory table is the only way I have seen it done successfully