Back in February, GM Authority was the first to report that the 6.6L V8 L8T engine was imminent for the Chevrolet Low Cab Forward truck. First introduced in the all-new 2020 Chevrolet Silverado 2500 HD and 3500 HD pickups trucks, the new L8T engine was later announced for the 2021 Chevrolet Low Cab Forward truck in March, offering up more power and torque than the 6.0L V8 L96 engine which it replaces. Now, we’re taking a closer look at how these two engines compare.
When equipped in the Chevrolet Low Cab Forward truck, the 6.6L V8 L8T produces 350 horsepower at 4,500 rpm and 425 pound-feet of torque at 3,800 rpm. That’s a boost of nearly 18 percent horsepower and 14 percent peak torque compared to the outgoing 6.0L L96 V8. The transmission used is the six-speed 6L90-E Hydra-Matic (RPO code MYD) with lock-up converter and overdrive.
Meanwhile, under the hood of the Chevrolet Express cargo van, the 6.6L V8 L8T engine produces 401 horsepower and 464 pound-feet of torque, bringing gains of 17 percent more horsepower and 24 percent more peak torque compared to the outgoing 6.0L L96 V8 in that particular application.
Check out the specs in the detailed table below:
|Vehicle||Chevrolet LCF||Chevrolet LCF||Chevrolet LCF||Chevrolet Silverado HD||Chevrolet Express|
|Model Year||2017-2020||2021+||+ / – 2021||2020+||2021+|
|Engine||6.0L V8 L96||6.6L V8 L8T||+0.6L||6.6L V8 L8T||6.6L V8 L8T|
|Horsepower @ RPM||297 @ 4300||350 @ 4500||+53||401 @ 5200||401 @ 5200|
|Torque @ RPM||372 @ 4000||425 @ 3800||+53||464 @ 4000||464 @ 4000|
- LCF = Low Cab Forward
The 6.0L V8 L96 is an old workhorse of an engine, producing 297 horsepower and 372 pound-feet of torque. However, it’s not the most power-dense, nor is it the most efficient. By comparison, the 6.6L V8 L8T is an all-new, modern truck engine.
That said, there is one drawback for the new L8T, namely the lack of a gaseous variant (CNG / LPG), which the L96 did originally offer. That said, the L8T should be able to run gaseous fuel quite well when such a configuration is offered, given its higher compression ratio.
As a reminder, the Chevrolet Low Cab Forward line of vehicles is a series of medium duty trucks offered as a result of a partnership between General Motors and Isuzu Motors, currently spanning two generations. The new L8T engine is destined for 3500 and 4500 models, while the other models in the LCF line include the 4500HD/XH and 5500 HD/XD diesels. The 3500 and 4500 models are also available with diesel engines, as supplied by Isuzu. The flagship of the Chevy LCF family is the 6500XD LCF Diesel, which is technically a totally different, much larger truck.