LB7 Vs LBZ- The Complete Comparison Guide!
You’ve probably heard of your engine’s RPO numbers, that is where the LB7 and LBZ come from. The RPO stands from the Regular Production Option, but what is the difference between LBZ and LB7? The main difference between the Duramax LB7 and LBZ is that the LB7 has 300 horsepower and 560 lb-ft of torque and…