Speaking from experience, DIKE does not work, it will slow the leak a little but it also clogs up everything else, heater core, heater hoses, radiator, etc etc. Don't put it in your truck. Lock and Stitch does not work, welding does not work. JB weld definately does not work. The block is so thin it will just crack in another spot, so don't waste your time and money, Buy a new block and do it yourself or waste some hard earned time and go after dodge/cummins. A new block at cummins should cost $1300. How many miles is on the truck?
Anyway welcome to the bend over and take it up the @$$ club. Now you wont even be able to sell your truck, they wont even take it on a trade in. no resale value whatsoever. Good luck.