Abstract: A unit cam section for each bank of cylinders in a "V"-type engine has a predetermined cam orientation between the fuel cam and the air cam and between the fuel cam and the exhaust cam wherein a first unit cam section has a fuel cam to air cam angle of between 56.degree. and 63.degree. and a fuel cam to exhaust cam angle of between 143.degree. and 153.degree. and a second unit cam section has a fuel cam to air cam angle of between 0.degree. and 7.degree. and a fuel cam to exhaust cam angle of between 88.degree. and 98.degree.. Each cam has a base circle diameter of at least 3.75 inches. An improved "V"-type diesel engine is disclosed which has multiple banks of cylinders such that one bank employs the first type of unit cam section and the other bank employs the second type of unit cam section wherein each cylinder has a corresponding inverted fuel rocker mechanism for engaging the fuel cam. Each fuel cam is adapted to provide a fuel cam lift to fuel pump plunger lift ratio of at least 0.8:1.0.