Help Us Get to 1,000!

3

2

7

Trucks Submitted

Don't Miss Out on Our Gen-Y Hitch GIVEAWAY!

6.6L LBZ Duramax Specifications & Information

6.6L LBZ Duramax Specs & Information

LBZ Duramax Specs & More

LBZ Duramax Specifications

The LBZ Duramax is one of the most highly sought after diesels today. Why?It’s more powerful than the LLY or LB7 Duramax and has almost none of the emissions found on the LMM, LML, and L5P trucks. The LBZ is only equipped with the exhaust gas recirculation system and lacks the diesel particulate filter and diesel exhaust fluid systems found on newer Duramax trucks. These trucks produce 360 Horsepower and 650 lb/ft torque and feature a beefier composition than the LLY. Find out more 6.6L LBZ Duramax specifications below.

LBZ Duramax Specifications

Manufactured Years:2001-2004
Engine Design: 6.6L 90-Degree V8 Turbocharged Diesel
Transmission:6-Speed Auto Allison 1000 Transmission
ZF650 Manual Transmission
Vin Identification:
(8th Digit)
D
Displacement:6.6 Liters or 403 Cubic Inches
Engine Weight:835 Lbs
Bore:4.055″ or 103 mm
Stroke:3.897″ or 99 mm
Block Material:Cast Iron
Cylinder Head:Cast Aluminum
Crankshaft:Forged Steel
Connecting Rods:Forged Steel
Compression Ratio:16.8:1
Firing Order:1-2-7-8-4-5-6-3
Turbocharger/Air:Garrett GT3788VA Variable Vane Turbocharger
And Intercooler
Fuel Injection:Direct Injection High Pressure Common Rail
with Bosch CP3 Injection Pump
Valvetrain:Overhead Valve (OHV) 4 Valves per cylinder (32V)
Engine Oil Capacity:10 Quarts With Filter
Fuel:Diesel
Fuel Tank Size:34 Gallons
Max Engine Speed:3,250 RPM
Horsepower:360 horsepower
Torque:650 lb/ft of torque

LBZ – The Duramax of Choice for Racing

The LBZ Duramax is commonly used in race applications because it offers easy power on a slightly more durable platform than the LB7 or LLY. It has a stronger block casting, stronger rods, and an ECM that makes tuning these trucks super productive and easy. At UCC this last year, we saw multiple LBZ Duramax trucks killing it at both the track and the dyno. Over 1,000 horsepower and 2,000 lb/ft of torque were surpassed by several LBZ Duramax builds. If you want to learn more about UCC, click here.

Silverado & Sierra LBZ Duramax Tow Capacity

Both Conventional and 5th wheel/gooseneck towing can vary depending on which LBZ Duramax you own. Check out our complete LBZ Tow Capacity guide below to find out how much your truck can tow! Make sure you check with your owners manual or with GM directly to find out your exact tow ratings.

2500 SRW Trucks

ModelConventional Tow Capacity5th Wheel Tow Capacity
2500 Crew Cab
Short bed 2WD
12,000 lbs15,400 lbs
2500 Ext. Cab
short bed 2wd
12,000 Lbs15,700 lbs
2500 Crew Cab
Short Bed 4WD
12,000 lbs14,200 lbs
2500 Ext. Cab
Short Bed 4wd
12,000 lbs15,400 lbs
2500 Crew Cab
Long Bed 2wd
12,000 lbs15,100 lbs
2500 Regular Cab
Long bed 2wd
12,000 lbs15,900 lbs
2500 Ext. Cab
Long Bed 2wd
12,000 lbs15,500 lbs
2500 Crew Cab
Long Bed 4wd
12,000 lbs13,200 lbs
2500 Regular Cab
Long Bed 4WD
12,000 lbs15,600 lbs
2500 Ext. Cab
Long Bed 4WD
12,000 lbs14,800 lbs

3500 SRW Trucks

ModelConventional Tow Capacity5th Wheel Tow Capacity
3500 Regular Cab
2WD
12,000 lbs15,400 lbs
3500 extended
Cab 2WD
12,000 lbs15,300 lbs
3500 extended
Cab 4WD
12,000 lbs15,000 lbs
3500 Crew Cab
2WD
12,000 lbs15,100 lbs
3500 Crew Cab
4WD
12,000 lbs14,700 lbs

3500 Dually Trucks

ModelConventional Tow Capacity5th Wheel Tow Capacity
3500 Regular Cab
4wd Manual
Transmission
12,000 lbs15,200 lbs
3500 Regular Cab
4WD Automatic
Transmission
12,000 lbs16,700 lbs
3500 Extended
Cab 2WD Manual
Transmission
12,000 lbs15,100 lbs
3500 Extended
Cab 2wd Auto
Transmission
12,000 lbs16,600 lbs
3500 Extended
Cab 4WD Manual
Transmission
12,000 lbs14,800 lbs
3500 Extended
Cab 4WD Auto
Transmission
12,000 lbs16,300 lbs
3500 Crew Cab
2WD Manual
Transmission
12,000 lbs14,900 lbs
3500 Crew Cab
2WD Auto
Transmission
12,000 lbs16,400 lbs
3500 Crew Cab
4WD Manual
Transmission
12,000 lbs14,500 lbs
3500 Crew Cab
4WD Auto
Transmission
12,000 lbs16,000 lbs

Want More Information about on The LBZ Duramax?

While we are huge fans of the LBZ Duramax, they have a lot of room for improvement. Check out our other LBZ posts to find out common LBZ Duramax problems, the best performance upgrades for the LBZ, and more! We also have tons of diesel truck resources for other variations of the Duramax like the L5P, LML, and LMM trucks!

DISCLAIMER: This website page contains affiliate links, which means that if you click on one of the product links and purchase the product, I’ll receive a small commission. This helps support Diesel Resource and allows us to continue to produce helpful diesel insight and content. Thank you for the support!

We Live & Breath Diesel.

Want to learn more about the latest insights in the diesel industry? Signup for our newsletter and stay up to date on the top trending topics!

ABOUT Kamil

Founder of Diesel Resource and a complete diesel head. Has a little bit of problem buying too many trucks. Learn more about him by checking out his truck.