How to clean surface rust from block?

[tsbpenguin]

So I bought a 2.7t BEL block from a guy that he had bored to 82.5mm for a 3.0 build but he must have stored it outside because it has some surface rust. My main concern is cleaning it out of the freshly bored/honed cylinders without having to re hone and take more material off the cylinder walls. Any recommendations? Acid wash? Electrolysis?

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[tsbpenguin]

Picture for reference:

20180427_144654.jpeg

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[tsbpenguin]

Bump

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[VR6Bomber]

That just looks like some surface rust probably from letting it sit in humidity without an oily coating to protect it.
Spray and wipe with some clean some motor oil or wd-40 to see if it just dissolves.



If that doesn't work the block is junk, I'll do you a favor and take it off your hands.