After soaking the water pump rear plate bolts for a couple of days I attempted to remove them. Four of them came out within a few seconds of pulling the trigger on my impact. The fifth (which was the second bolt I attempted) stripped. I inspected the four I removed and decided that all of them were going to be replaced. I ground off the fifth bolt expecting it just to come off with a few taps. No such luck, it wasn't the threads that were fused. It was fused to the backing plate's threadless space. I had to drill it out. Thankfully it came off undamaged. It's just waiting for me to install it in the car tomorrow.

