tater,
JB Weld is worth a try (trust Paul Harvey and stevesr and Kenner).
Several years ago I had a leaking "freeze" plug and I most likely cracked the block of 261 above the rear/side plug when trying to remove it. After fixing the leak and finding the crack, and after crying to myself, I figured "what the hey"; might as well try that JB Weld stuff.
No leaks in 5 years. It IS worth a try. I drilled an indentation at each end of the crack in my block before I carefully cleand-up the area and applied JB Weld.
Good luck,
Tim
