Not Ranked
JB Weld is not something I consider "temporary". The stuff has such a long life I would put it in the category of "permanent".
IF the crack does indeed continue to grow a chemical solution (like JB Weld) will not work. Then again, the same could be said about welding it (which is something I would consider doing WITH the motor in the car).
Typically, for a crack, you would indeed drill holes at the end of each. But, it's possible the weld would be fine without doing so. Doing it "in car" be aware you may have to do it a couple of times and perhaps using different techniques. In the end, you MIGHT have to pull the motor. I think it's worth while attempting an in car repair. Thus, my first approach would in fact be JB Weld.
Ernie
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