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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Powered by GMC Twin-Six V12
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What was the GMC Twin Six?, The Daily Drive
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What was the GMC Twin Six?, The Daily Drive
GMC's Low RPM Gasoline 11.5-litre V12
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