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

The 2001-2004 GM 6.6L Duramax Cylinder Heads play a crucial role in your truck's rotating assembly, helping determine compression and working with the camshaft and valvetrain to shape the engine's power and torque curve. This becomes even more important when upgrading or modifying your engine, as the stock head often falls short in high-performance applications. Fortunately, we offer a range of aftermarket cylinder heads designed to significantly improve airflow, allowing your Sierra/Silverado 2500HD/3500HD to harness more power and support various performance upgrades. Unlock your engine’s full potential and let it breathe easier with any of the aftermarket cylinder heads available at Alligator Performance! Check out our selection of Oil Pans, Valve Covers & Accessories for further performance and reliability! 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>2004.5-2005 6.6L LLY
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Mahle HS54580 Head Set | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Mahle HS54580 Head Set | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Mahle

Mahle HS54580 Head Set | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Sale price
$250.71
Regular price
$565.70
PPE 110100101 Cast Iron Cylinder Head | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
PPE 110100101 Cast Iron Cylinder Head | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

PPE

PPE 110100101 Cast Iron Cylinder Head | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Price
$1,349.99
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Industrial Injection

Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$737.11
Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Fleece Performance Products

Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Price
$1,099
Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Fleece Performance Products

Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Price
$1,099
Fleece FPE-BRAB-D1 32V Rocker Bridges | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-BRAB-D1 32V Rocker Bridges | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Fleece Performance Products

Fleece FPE-BRAB-D1 32V Rocker Bridges | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$512.54
Merchant 10233 ARP Rocker Shaft Bolt Kit | 2001-2012 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 10233 ARP Rocker Shaft Bolt Kit | 2001-2012 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 10233 ARP Rocker Shaft Bolt Kit | 2001-2012 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$24.72
Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wagler Competition Products

Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$450
SoCal Diesel LB7stage2 Stage 2 LB7 Cylinder Heads | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
SoCal Diesel LB7stage2 Stage 2 LB7 Cylinder Heads | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SoCal Diesel

SoCal Diesel LB7stage2 Stage 2 LB7 Cylinder Heads | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Price
$4,000
Merchant 10196 Automotive Upper Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Merchant 10196 Automotive Upper Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Merchant Automotive

Merchant 10196 Automotive Upper Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Price
$9.72
Industrial 449E01 Stage 1 Pushrods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 449E01 Stage 1 Pushrods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Industrial Injection

Industrial 449E01 Stage 1 Pushrods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$23.92
PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Price
$539.99

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

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