At launch, the 6.5 Detroit diesel engine produced 180 horsepower and 360 lb-ft of torque. By the time GM started moving away from the 6.5-liter V8, its output had climbed to 215 hp and 440 lb-ft ...

The 6.7L Cummins engine has been around for almost two decades. Here’s how much horsepower the stock versions of the 6.7 have produced over the years.