# GMC's Remarkable Twin Six Engine: The Story Behind General Motor's Monstrous V12

> The 1960s were friendlier times for American motorists. The national average gas price between 1960 and 1962 was only $0. 31 per gallon, and there were no EPA regulations to ruin the fun.

- **Source:** [SlashGear](https://www.slashgear.com/1820761/gmc-massive-v12-twin-six-engine/?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=67e625d9ba30600cc3c436f9)
- **Published:** 2025-03-28
- **Category:** Cars
- **Tags:** #behind #engine #general #monstrous #motor #remarkable #story #twin
- **Canonical:** http://localhost:4321/a/67e625d9ba30600cc3c436f9

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_GearOpen's distilled summary. The full original article is published at SlashGear (source link above); GearOpen does not republish the source's full text._