If it is actually a crack in the block it is not a DIY repair. It would need to be torn down to the bare block. The passage verified and then the block baked and cleaned, then the crack could be welded and the oil passage cleaned out.
I would suspect it is actually a gasket that has failed. If you could take a picture and post it that would help.
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Friday, September 15th, 2017 AT 12:28 PM