2001-2004 GM 2500HD/3500HD 6.6L LB Duramax Engine & Performance

2001-2004 6.6L Silverado & Sierra 2500HD/3500HD

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Crate Engines

Crate Engines

2001-2004 GM 2500HD/3500HD 6.6L LBZ Duramax Gaskets, Gasket Kits & Bearings

Gaskets

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Glow Plugs

Glow Plugs

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Head Studs & Main Studs

Head Studs & Main Studs

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Heads & Valve Train

Heads & Valve Train

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Motor Mounts

Motor Mounts

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Oil Pans

Oil Pans

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Rods, Pistons, Cams, & More

Rods/Pistons/Cams & More

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PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119030130
$197.99
$219.99
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE168030170
$269.99
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE168030140
$269.99
Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Powerstroke Products

Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PWSIFG-JD66-12-220
$449
Choate Engineering CEP66LB7SD 6.6L Duramax Daily Driver Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Choate Engineering CEP66LB7SD 6.6L Duramax Daily Driver Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Choate Engineering

Choate Engineering CEP66LB7SD 6.6L Duramax Daily Driver Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: CHTCEP66LB7SD
$9,000
Choate Engineering CEP66LB7SW 6.6L Duramax Workhorse Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Choate Engineering CEP66LB7SW 6.6L Duramax Workhorse Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Choate Engineering

Choate Engineering CEP66LB7SW 6.6L Duramax Workhorse Short Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: CHTCEP66LB7SW
$11,500
Choate Engineering CEP66LB7LW 6.6L Duramax Workhorse Long Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Choate Engineering CEP66LB7LW 6.6L Duramax Workhorse Long Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Choate Engineering

Choate Engineering CEP66LB7LW 6.6L Duramax Workhorse Long Block | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: CHTCEP66LB7LW
$14,800
$15,000
Choate Engineering CEP66LB7LD 6.6L Duramax Full Running Daily Driver | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Choate Engineering CEP66LB7LD 6.6L Duramax Full Running Daily Driver | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Choate Engineering

Choate Engineering CEP66LB7LD 6.6L Duramax Full Running Daily Driver | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: CHTCEP66LB7LD
$12,500
Cometic C5883-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-051
$147.30
Cometic C5882-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-056
$195.30
Cometic C5882-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-051 MLS Cylinder Head Gasket - .051 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-051
$147.30
Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-027
$147.30
Cometic C5883-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-056 MLS Cylinder Head Gasket - .056 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-056
$195.30
Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-075
$195.30
Cometic C5882-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch RHS | 01-16 GM Silverado/Sierra 2500HD, 07-16 3500HD Duramax
Cometic C5882-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch RHS | 01-16 GM Silverado/Sierra 2500HD, 07-16 3500HD Duramax

Cometic

Cometic C5882-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch RHS | 01-16 GM Silverado/Sierra 2500HD, 07-16 3500HD Duramax

SKU: COMC5882-075
$195.30
Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-045
$147.30
Cometic C5883-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-060
$195.30
Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-060
$195.30
Cometic C15043 17-Bolt Fiber Oil Pan Gasket Lower - .060 inch | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15043 17-Bolt Fiber Oil Pan Gasket Lower - .060 inch | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C15043 17-Bolt Fiber Oil Pan Gasket Lower - .060 inch | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC15043
$19.03
Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMPRO3008B
$190.90
Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-040
$147.30
Cometic C5882-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-040
$147.30
Cometic C15376-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15376-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C15376-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC15376-053
$195.30
Cometic C15375-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15375-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C15375-053 .053 inch MLX Cylinder Head Gasket - 4.130 inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC15375-053
$195.30

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2001-2004 6.6L Silverado & Sierra 2500HD/3500HD

Power Lift Shop All

The 6.6L Duramax LB7 under the hood of your 2001-2004 GM Sierra/Silverado 2500/3500 may be one of the best and most efficient engines out there, but even the toughest trucks have some power and performance waiting to be unleashed through various performance modifications. Here at Alligator Performance, we carry a selection of cold air intakes, tuners, fuel upgrades, and turbo upgrades to help you get the most out of your diesel engine. Many of these upgrades like the cold air intakes and fuel upgrades even help promote component longevity so you can enjoy long-lasting and consistent performance without compromise. After you've added a few engine upgrades to your custom build, be sure to check out our premium 2001-2004 GM 6.6L Duramax LLY Transmission Upgrades to compliment the increase in power you're throwing down! GM Duramax Fitments: 2001, 2002, 2003, 2004 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.

GM Duramax>2001-2004 6.6L LB7
Tuners & Monitors
Cooling Upgrades
Head Studs & Main Studs
Rods, Pistons & Cams
Heads & Valve Train

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