Does anybody remember mobile engine overhaul outfits?

These procedures were called "overhauls". My parents used a shop in Macon called The Carlisle Garage. Two brothers, Harold and Junior Carlisle owned and operated it. They were in business from the late 40s until the mid 80s. Harold is still alive today. These guys did everything right in their shop. Boring blocks, valve jobs, complete cylinder head work, you name it. The boring bar they used was the same type those portable jobbies had. Theirs was a Quick Way. It bored one cylinder at a time. Then you moved the bar to the next cylinder and bored it and so on. They were way old school, but two of the best mechanics for their time in this area. An era gone by for sure.

We have a couple of mobile auto repair businesses around here, but they are fly by night bullcrappers who don't know anything. I wouldn't let them work on my lawn mower.

I owned a mobile service in CA for years and had a good enough rep in the area that I got sued by one of the biggest local shops for taking his business away from him.:D
He didn't win or anything because I didn't do anything wrong, but he was sure pissed about it.
He told the judge he had way more overhead than I did having a building and a bunch of employees, but the judge told him he picked his way of doing his business and I picked mine so all that expense was his own problem.

Never did any crank grinding on my truck though.:D