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2021 Chevrolet Express and Low Cab Trucks Shift to 6.6L Gas V-8

The New Big V-8 Replaces Old 6.0L

Chevrolet Commercial announced at the Work Truck Show that a new 6.6L V-8 gasoline engine for the 2021 Chevrolet Express and 2021 Chevrolet Low Cab Forward will replace the 6.0L gasser. While the 6.6L offering, which will be available late this summer, is new for the Express van and Low Cab Forward, the engine was actually first introduced in the 2020 Chevrolet Silverado 2500HD and 3500HD pickups.

The 6.6L in the Chevy Express will be rated at 401 hp and 464 lb-ft of torque (which is the same as the Silverado's rating); the outgoing 6.0L V-8 Vortec was rated at 341 hp and 373 lb-ft of torque. Not surprisingly, the take-rate for the current Express with the 6.0L V-8 option is about 70 percent, and Chevrolet expects that to climb even higher with the new 6.6L.

The 6.6L in the Low Cab Forward will be rated at 350 hp and 425 lb-ft of torque; its outgoing 6.0L (which was in the LCF 3500 and 4500) was rated at 297 hp and 372 lb-ft of torque.

We assume the 6.6L in the Express and LCF will be paired with the same 6L90 six-speed automatic transmission as in the gasoline 6.6L Silverado HD. The additional hp and torque, along with a wider torque band, should result in responsive, on-demand power and plenty of towing and payload confidence.

Not to be ignored, the 6.6L Duramax-powered Chevrolet Silverado 4500HD, 5500HD, and 6500HD medium duty chassis cab trucks get some useful updates: maximum gross combined weight rating on 37,000 pounds, new mechanical locking rear axle, longer axle-to-end-of-frame options, new extended mirror arms, new left-hand power take-off capability, and six additional upfit switches in the headliner.

GM's commercial fleet business reports a 67 percent increase in sales since 2013, and the company continues to invest in the future with multiple investments in manufacturing plants (Flint, Michigan; Brookville, Ohio; Wentzville, Missouri) that will increase production of its trucks, vans, and engine components.