The story of GM's high-tech straight-six (also called the Vortec 4200) and why it died:
https://www.topspeed.com/cars/car-news/the-forgotten-inline-engine-gm-s-42-liter-atlas-i-6-ar174949.html
"That Atlas family had three main members, the front-running 4.2-liter inline-six, the 3.5-liter five-cylinder, and the 2.8-liter four-cylinder. All three shared the same basic architecture and a wide range of parts, though it was the 4.2-liter that led the Atlas program.
The 4.2-liter called the GMT360 platform home. This included the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Oldsmobile Bravada, Isuzu Ascender, and Saab 9-7X. Each of these mid-sized SUVs shared the same architecture ..."
https://www.topspeed.com/cars/car-news/the-forgotten-inline-engine-gm-s-42-liter-atlas-i-6-ar174949.html
"That Atlas family had three main members, the front-running 4.2-liter inline-six, the 3.5-liter five-cylinder, and the 2.8-liter four-cylinder. All three shared the same basic architecture and a wide range of parts, though it was the 4.2-liter that led the Atlas program.
The 4.2-liter called the GMT360 platform home. This included the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Oldsmobile Bravada, Isuzu Ascender, and Saab 9-7X. Each of these mid-sized SUVs shared the same architecture ..."
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