So I've got my '69 318 block back from the machine shop, and as I'm rotating it on the engine stand some bits of corrosion fall out the water jacket holes on the top of the block. Looking down in the jacket I can see some chunks of flaky rust the I can knock loose with a screwdriver, but now I've got to actually get them out of the block. What's the best way to do this? Knock out a freeze plug and run my shop vac or compressor through it? Flush it out with something? The block is bare, so I'm a little worried about corroding or damaging the freshly machined surfaces.
Additionally, it looks like there's some really tough corrosion at the bottom of some head bolt holes. I can knock out some with my pick but not all. My fear is that this corrosion will prevent the head bolts from torqueing correctly. Thoughts?
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