Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

New 6.6 gas is RPO L8T

Recommended Posts

'GM Authority' website is reporting that GM Powertrain has said the new HD 6.6 gas will be RPO Code L8T


GM 6.6 Liter V-8 L8T Engine
The L8T is a gasoline engine produced by General Motors for use in Heavy Duty pickup trucks. The engine displaces 6.6 liters in a V8 configuration and an OverHead Cam (OHV) layout otherwise referred to as push-rod.

It is part of GM’s fifth-generation Small Block engine family and made its debut in the all-new 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD.

The 6.6L V8 L8T is built on a cast-iron Small Block, enabling it to have long-term durability. Thanks to aluminum heads and direct injection, the engine delivers more precise fuel control resulting in a higher compression ratio of 10.8:1. That enables a power output of 401 horsepower and 464 pound-feet of torque (in the 2020 Silverado HD and 2020 Sierra HD), with strong performance at low rpm, where it is needed when pulling away with a loaded cargo box or trailer.

The L8T also features a forged steel crankshaft, forged powder-metal connecting rods and additional high-strength components to provide the added strength and durability demanded by Heavy Duty truck customers.

The L8T replaces the 6.0L V8 L96 / LC8 engine and makes over 11 percent more horsepower and over 21 percent more torque.

Vehicle Applications
Manufacturer    Model Year    Make    Model    Transmission    Power (hp / kW) @ RPM    Torque (lb-ft / Nm) @ RPM
General Motors Company    2020    Chevrolet    Silverado HD    6-speed auto (6L90)    401 / 299 @ 5200 (SAE certified)    464 / 629 @ 4000 (SAE certified)
General Motors Company    2020    GMC    Sierra HD    6-speed auto (6L90)    401 / 299 @ 5200 (SAE certified)    464 / 629 @ 4000 (SAE certified)
GM RPO Code:    L8T
Type:    6.6L V-8 gasoline
Bore & Stroke (in / mm):    4.06 x 3.86 / 103.25 x 98
Block Material:    Cast iron with nodular iron main caps
Cylinder Head Material:    Cast aluminum
Compression Ratio:    10.8:1
Valvetrain:    Overhead-valve, two valves per cylinder, variable valve timing
Fuel Delivery:    Direct fuel injection
Power (hp / kW @ rpm):    401 / 299 @ 5200 (SAE certified)
Torque (lb.-ft. / Nm @ rpm):    464 / 629 @ 4000 (SAE certified)
Predecessor:    6.0L V8 L96/LC8
Successor:    None currently

Read more: http://gmauthority.com/blog/gm/gm-engines/l8t/#ixzz5esWm11G5




  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.