Once upon a time, GMC created a V12 monster of an engine it called the Twin Six. It was massive, powerful, and not eco-friendly in the least.
Once upon a time, GMC created a V12 monster of an engine it called the Twin Six. It was massive, powerful, and not eco-friendly in the least.
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GMPhotoStore - The GMC Twin-Six is the GM V12 engine you probably never heard of. Built with a specific 12 cylinder block and crankshaft, the Twin- Six used two sets of V6 pistons
A Look Back at the 702ci GMC Twin-Six V12 Engine
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