[HardcoreZ28]

So I found a crack in one of the engine cases from my bike this weekend....after I powdercoated it unfortunately. Instead of just slapping it back together or JB Welding it and hoping for the best I'm going to attempt to weld it.

My local welding house had aluminum MIG wire and hooked me up with a half tank of straight argon to shield the weld. I know I have to v out the crack before I weld. Any other suggestions on doing the job? The surface is completely free of oil so impurities shouldn't be a problem.