In Jay Leno’s recent restoration update video he explains how a rod went through the block of a 20.0 L four-cylinder powered 1913 Christie fire engine. Instead of throwing the block away his team decided to repair a large hole with Lock-N-Stitch repair system. Some reading this article might know about the process since the company was founded in 1990 but I had never heard of them. The repair process does not involve any heat but instead uses precise drilled holes in very specific steps and then inserting a pins with glue.
Jay begins talking about fixing the engine block at the beginning of the video.
Videos from Lock-N-Stitch showing the repair process.