Case air leak

[gsustaitav19822]

So i just did a top end on my blaster but when i got to the air leak down test i fount out that i have a bottom end leak where the 2 halfs meet under the crankshaft
What would be the beat way to fix it with out splitting the cases

 

[dirtysquared]

Is it leaking from the case halves seam....or is the case cracked ?

If it's the seam, split the cases, lap them, and put it back together with some yamabond.