Pinhole/crack in Block repair?

There is also a product called LOCK-N-STITCH.

LOCK-N-STITCH Inc. products and kits are used by not only Cummins Diesel themselves, but also Caterpillar, Chrysler, Mack Trucks, and others in the business of keeping the wheels turning.

http://www.locknstitch.com/cracked_engine_block_repair.htm