Corresponding article about the 6.5.

6.5L diesel specs, history, and information. The 6.5 diesel was manufactured by Detroit Diesel, a division of General Motors during the time period and used in Chevrolet/GMC trucks from the 1992 to 2000 model years. AM General continues to produce the 6.5L for U.S. Army applications.

Source: 6.5L GM/Detroit Diesel Specs & Information