Dauntless V6: The Discarded GM Engine That Became A Jeep Legend

GM has built a long line of iconic engines, including the classic LS engine. One of its most recognizable engine designs, however, nearly disappeared before finding a second life as the Dauntless V6. To understand the story, it's important to recognize the desire among American automakers to build powerful, high-performance engines in the 1960s.

The origins of the Dauntless V6 go back to Buick's aluminum 215-CI Fireball V8 program, which the company moved away from as larger V8s became more popular. However, Buick decided to use that engineering approach to create another engine, the 198-CI Fireball V6. This smaller engine was designed to provide a balance of both power and efficiency. Eventually, Buick expanded the Fireball V6 to 225 cubic inches, and Kaiser Jeep purchased that version and renamed it the Dauntless V6.

The Dauntless V6 earned its legendary status after being introduced as an engine option for the Jeep CJ-5 and CJ-6 in 1965. The Dauntless V6 produced 155 hp and 225 lb-ft of torque, almost double that of the standard four-cylinder engine. The Dauntless V6's lasting reputation among the Jeep community rests on more than its numbers, though, with its great parts ecosystem and easy swapping, coupled with the low-end torque, making it one of the automaker's most popular six-cylinder engines.

Before the arrival of the Dauntless V6, Jeep's inline-4 arguably hobbled the Jeep CJ lineup. In 1962, for example, the CJ-3's engine made a paltry 75 hp and 114 lb-ft of torque, which kept the trucks somewhat limited. But when Kaiser Jeep introduced the 225-cubic-inch Dauntless V6 in 1966, the Jeep CJ models finally had an engine that matched the rest of their capabilities. Additionally, since the Dauntless V6 was lighter than larger engines, it meant that Jeep could offer drivers a new CJ that had agility as well as power.

The CJ wasn't the only Jeep to benefit from the Dauntless V6, as the automaker also offered it in the 1966 Jeepster Commando. The Commando was a new addition to the company's lineup at the time, and the Dauntless offered compelling performance in the Commando without weighing too much more than the four-cylinder. Jeep buyers had another option that could handle both recreation and utility, and the Commando eventually became one of the 10 best Jeeps ever designed.

But while the Dauntless V6 became an important part of Jeep's lineup, its story did not end there. Following AMC's acquisition of Jeep in 1970, the Dauntless V6 actually returned to Buick. From there, the engine was updated and used in a wide range of vehicles for the automaker moving forward, cementing the Dauntless V6 as one of the company's most successful engines.