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. During this time, American legacy automaker General Motors debuted its monstrous 11.5-liter V12 engine for heavy-duty trucks, and it remains a giant even by modern standards. How big? It’s the largest-displacement production engine from a major automaker since WWII. Affectionately called the Twin Six V12, this gargantuan
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