http://www.detroitdiesel.com/Public/specs/3SA356.pdf
You must be confusing a Detroit with a CDC.
Better stick with ihguy and not try to be detroitguy! Maximum torque is at 1200 RPM
A 12.7 will pull better and is more fuel efficient in the 1200-1400 RPM range! The spec sheets don't lie.
Detroit 12.7 pulling ability?
