Rust coming out of the internal water areas after Machine Shop work complete

[Stryker14]

After getting my block back from he machine shop after hot tank, boring, removing flashing, ect.

I'm starting to things together, I flip the engine over and I see some rust come out. I start poking in the water holes and flip it again. This is what I am seeing.

This can't be normal. Or is it?

Any help would be welcome as I do not have much experience with this.

[nissanfreak12]

I would really question if he actually hot tanked it.

In retrospec, completely normal for a higher mileage engine that was not taken car of. Looks like someone before you didn't do proper maintenance on the cooling system. A proper hot take would have taken care of the loose particles inside the galleys. Its also very possible the shop didn't replace the freeze plugs which can also cause a not so good tank job.