Re: Block water jacket rust removal and best engine paint.
For heavy rust removal in the water jacket areas I use 'Pool Cleaning Acid". Have the block on an engine stand, level it, plug any open bolt holes, make a plate to cover the timing cover water holes. No need for a gasket there, a flat plate held on with two bolts should be enough. Fill the block with the "Acid" to just below the deck surface. Now let it sit for two or so hours. Remove the drain plug on the side of the block & drain into a plastic container to re-use. Don't breath the fumes & best to do this outside. Once drained wash out with water. If it's still not clean enough, repeat. Then do the other side. It will come out looking brand new internally.
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