7M short block strength in high torque applications in question.

[dumbo]

Semi's don't use twins like a gasoline engine, they're compound...

Somthing like that, its not out of a semi truck but same deal.(In Pic)

why do most semi trucks in the 500+hp range use twins instead of a single? Why do those trucks make peak torque 20-30% earlier than even weaker single turbo trucks?

Diesles are a bit different. Power band wise. Same concept though.