Your'e almost 100% sure of what???? That your gonna be in the market for a new engine soon, or that you really want to rebuild the entire engine after 5 heat cycles. Because you'll be lucky to get that far if you take a da sander with 80 grit to the block.
I'm sorry but that's simply the most ignorant statement that I have heard in a long time. You can do this by hand if you have to without a lapping tool. You would be better to get a straight 2x4 instead of a powered sander.
Start with 240 grit and a sanding block from the autobody section of your local parts house. Get a feeler gauge and a tool with a machined edge. Use fresh cheap oil as lubricant. Atleast this way you can't screw anything up to the point of having to pull the block.
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