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• The GMC 'Twin Six' Is An Insane 11.5-Liter Four-Head V12 Meant To

The GMC 'Twin Six' Is An Insane 11.5-Liter Four-Head V12 Meant To

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The GMC Twin Six is the monstrous 11.5-liter all-American gasoline-powered V12 that you need to know about.

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