I have watched my great Uncles do that several times. They torch the front end and sometimes the mounts and secure a HUGE logging chain to the engine and take off in the truck and when the chain reaches the end.... out comes engine and trans. Load em up and scrap em. I watched them do it to a pristine falcon pickup truck once. They jerked the engine/trans and part of the cap off the car. Chain was about 80 ft long

. Fun to watch

.
Tommy