I may play with mine to see if it stays, worse case is I throw it away or remachine it anyways. The worst thing is the bores for the rockers, they have tight tolerances and need to be inline, one is right below the bad spot and any movement will make them not fit. It would be more work than it's worth to have to bore out any of those to put a bushing in and then re-line bore it.
I can see the crack on the inside, it goes right betweem the 2 bosses for the rocker shaft, a small TIG torch will fit but there won't be any room for the side to side sweep, MIG would work but not as nice, also welding inside would cause the cover to cup inward, how much again ,can't say, but any little bit will be a problem . If I do mine I'll just drill a small hole at each end of the crack and weld the outside.
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