There is a application where a main girdle made the difference of spitting the crank out or keeping the bottom end together.

In the late 80-s we were spitting the crank and rods out the bottom of a 466 JD inline 6 with two large turbos in series with a hidden 150 shot.

We ended up taking a 1 inch slab of al. and indexed it off the pan rail bolts so every main cap was tied together and then tied into the side rails of the block.

We had the pistons and valves coated with the same plasma coating used on the space shuttle at that time at 8k for the coatings but in the end we stopped spitting out the bottom end and stopped melting pistons.

Later we ended up machining an al. overhead cam head, and we cut the cores as sent them to crane to grind the lobes for us.

The head was one piece and the supports for the camshaft were separate but pinned and held in place by opposing head bolts.

That tractor got banned by the ntpa as they couldn't keep changing the rule book to keep up and we sold it to a team in Europe.

Anyway in that situation it did help.