Amazing A Never Seen Watch This Caterpillar Cracked Head Repaired Process Like This Works

They might do.... But it was the SLOW thruogh heating of the entire casting - and then the welding - and then the covering with dried cow shit briquets and burning them... it's a good overall post weld stress relief - this is where where secret lies... it's not that welding cast iron heads is a hard to impossible thing for many castings, it's the through heating, and the extremely slow cool down - that is the secret. They kept the head in "a bed of heat" - being the charcoal and the insulating covering plates.

It's when people do them in the open air with big blow toches, that the differential cooling and inadequate through or overall heating that causes stress cracking to occur, "Wow what a great job!" - "Kek" = huge crack noise from a break across the casting.