Atlas is a name for a family of modern inline

Straight engine

Usually found in four- and six-cylinder configurations, the straight engine, or inline engine is an internal-combustion engine with all cylinders aligned in one row, with no offset...

 piston engines for truck

Truck

A truck or lorry is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration, with the smallest being mechanically similar to an automobile...

s from General Motors. The series debuted in 2002 with the Oldsmobile Bravada

Oldsmobile Bravada

The Oldsmobile Bravada is a mid-size luxury sport utility vehicle from the now retired Oldsmobile marque of General Motors. There have been two different vehicles to bear this model name, the first and second-generation GMT330, and the 2002 to 2004 GMT360....

, and is also used in the Chevrolet TrailBlazer

Chevrolet TrailBlazer

The Chevrolet TrailBlazer is a mid-size sport utility vehicle produced by the Chevrolet division of American automaker General Motors.On November 10th, 2011, General Motors officially revealed a second generation of the vehicle to be sold worldwide...

 and Colorado

Chevrolet Colorado

The Chevrolet Colorado and its counterpart, the GMC Canyon, are mid-size pickup trucks by American carmaker General Motors. It was introduced in 2004 to replace the Chevrolet S-10 and GMC Sonoma compact pickups.-First generation :...

 and their GMC

GMC (General Motors division)

GMC is a manufacturer of trucks, vans, military vehicles, and SUVs marketed in North America and the Middle East by General Motors Company. In January 2007, GMC was GM's second-largest-selling North American vehicle division after Chevrolet, ahead of Pontiac....

 twins, the Envoy

GMC Envoy

The GMC Envoy is an SUV from the GMC marque of General Motors. It was introduced as a high-end version of the Jimmy for the 1998 model year, the same year the Jimmy was restyled...

 and Canyon. In production, the engines use GM's Vortec

GM Vortec engine

Vortec is a trademarked name for a line of piston engines for General Motors trucks. The name first appeared in 1988 on a 4.3 L V6 that used "vortex technology" to create a vortex inside the combustion chamber, creating a better air/fuel mix. Now its used on a wide range of different engines...

 name, and I4

Straight-4

The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....

, I5

Straight-5

The straight-five engine or inline-five engine is an internal combustion engine with five cylinders aligned in one row or plane, sharing a single engine block and crankcase...

, and I6

Straight-6

The straight-six engine or inline-six engine is a six-cylinder internal combustion engine with all six cylinders mounted in a straight line along the crankcase...

 engines are all part of the same family, sharing the same manufacturing equipment, rods, pistons, valves, and other parts.