Cylinder wall weld??

Dan the man said

You can't grind the deck surface of a block, it has to be taken to a machine shop and milled down

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you absolutely could.

i wouldn't try it with a grinder. but knock down the big ugly with a file and then use paper on a rigid block, slowly and methodically working your way up thru grits should give a satisfactory finished product.

i may get dragged for this, but a composite gasket might be a call for use here. a good MLS gasket would probably be fine TBH