![]() ![]() By simply changing the bore diameter, the displacement of the same engine block could now be increased for more power and torque. Over the years, GM has saved a bundle on manufacturing the 3.1L engine by using the production line tooling it originally developed for the 2.8L V6. The larger 3.4L version has been imported into the U.S. Today, the 3.1L lives on in China where it is being made in various displacements (2.5L, 3.1L and 3.4L) for GM’s Chinese-built Buicks. The 3.1L was eventually replaced with various versions of the 3.4L V6. The engine itself was based on the earlier 2.8L V6 that was first produced back in 1980. The engine itself went through continual evolution and improvement during its production life, including Gen II and Gen III versions, plus an “Enhanced 3100” version from 1999 to 2001. Over 10 million of these engines were built during this period. ![]()
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