Horsepower Road Blocks: Duramax LB7

Published in the June 2009 Issue June 2009 News, Duramax

While a relatively new entry into the light duty diesel market, the Duramax line of engines have made a huge impact over the past few years in the performance market.


The Duramax 6.6 liter engine first appeared in the GMC and Chevrolet pickups in 2001. For the first four years, this engine (named LB7) remained unchanged and proved to be a sound offering. During that time, there were a few minor changes that needed to be made, but all and all the engine held up quite well considering it was a ground-up new design.


In 2004.5 the engine was updated to the
LLY and in 2005 it became the LBZ. The latest version, the LMM, appeared in 2007.5 and remains the current design. Our series covered the horsepower road blocks for the LBZ engines in the second part of this series. So, for this final installment, we opted to go back to the original LB7 for the receipts.


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