The LB7 Duramax is a 6.6-liter turbo-diesel V8 engine produced by Isuzu and General Motors, used in Chevy and GMC HD trucks from 2001 to early 2004. It introduced common-rail fuel injection to the Duramax lineup, delivering around 300 horsepower and 520–560 lb-ft of torque, paired with either an Allison 1000 automatic or ZF-6 manual transmission. Known for its strong performance, great fuel economy, and pre-emissions simplicity—no EGR or DPF systems—the LB7 earned a reputation as a durable and p
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