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    LLY Duramax Engine


    LLY Duramax Gaskets & Seals
    LLY Duramax Gaskets & Seals
    LLY Duramax Rotating Assembly
    LLY Duramax Rotating Assembly
    LLY Duramax Studs & Fasteners
    LLY Duramax Studs & Fasteners
    LLY Duramax Cooling System
    LLY Duramax Cooling System
    LLY Duramax Valvetrain
    LLY Duramax Valvetrain
    LLY Duramax Up Pipes
    LLY Duramax Up Pipes
    LLY Duramax Oil Pan
    LLY Duramax Oil Pan
    LLY Duramax Exhaust Manifolds
    LLY Duramax Exhaust Manifolds
    Restore or upgrade your 2004.5–2005 LLY Duramax 6.6L engine with top-tier components built for power, reliability, and longevity. From complete long blocks to internal engine parts like pistons, camshafts, and bearings, every product is engineered to meet or exceed OEM standards. Whether you're performing a full rebuild or a performance upgrade, our high-quality LLY Duramax engine parts deliver the strength and durability your diesel demands.

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    Duramax Billet Engine Oil Cap AFE 79-12002
    Duramax Billet Engine Oil Cap AFE 79-12002 $90.07
    Fits: Duramax 2001-2015
    Oil Catch Can Mishimoto MMOCC-RB
    Oil Catch Can Mishimoto MMOCC-RB $127.95
    Fits: Universal
    LB7|LLY|LBZ Duramax Amp Alternator XDP 220
    LB7|LLY|LBZ Duramax Amp Alternator XDP 220 $299.95
    Fits: Duramax 2001-2007
    Duramax Gear Reduction Starter XDP XD251
    Duramax Gear Reduction Starter XDP XD251 $299.95
    Fits: Duramax 2001-2019
    Duramax Gear Reduction Starter Mean Green 6600
    Duramax Gear Reduction Starter Mean Green 6600 $439.00
    Fits: Duramax 2001-2019
    LB7|LLY|LBZ Duramax High Output Alternator XDP XD355
    LB7|LLY|LBZ Duramax High Output Alternator XDP XD355 $477.95
    Fits: Duramax 2001-2007
    Duramax Power Belt Tensioner Alliant AP63449
    Duramax Power Belt Tensioner Alliant AP63449 $137.19
    Fits: Duramax 2002-2016
    Duramax CAT Fuel Filter Adapter Sinister Diesel SD-CAT-DMAX
    Duramax CAT Fuel Filter Adapter Sinister Diesel SD-CAT-DMAX $149.99
    Fits: Duramax 2001-2016
    LB7|LLY|LBZ Duramax High Output Alternator Mean Green 8247
    LB7|LLY|LBZ Duramax High Output Alternator Mean Green 8247 $439.00
    Fits: Duramax 2001-2007
    Silverado HD Clutch Master Cylinder Push Rod Bushing GM 12473050
    Silverado HD Clutch Master Cylinder Push Rod Bushing GM 12473050 $28.59
    Fits: Chevrolet Silverado HD 1999-2013 & 2015-2018
    Duramax 2004-2010 Engine Coolant Hose GM 97354884
    Duramax 2004-2010 Engine Coolant Hose GM 97354884 $30.64
    Fits: Duramax 2004-2010
    Duramax Billet Aluminum Oil Cap XDP XD477
    Duramax Billet Aluminum Oil Cap XDP XD477 $29.95
    Fits: Duramax 2001-2024
    Manual Control Positive Air Shutdown BD 1036733-M
    Manual Control Positive Air Shutdown BD 1036733-M $748.95
    Fits: Universal - 4 Inch Intake Systems
    Positive Air Shutdown With Electric Control BD 1036739
    Positive Air Shutdown With Electric Control BD 1036739 $946.95
    California Restricted
    Fits: Universal - 4 Inch Intake Systems
    Universal Carbon Fiber Oil Catch Can Mishimoto MMOCC-CF
    Universal Carbon Fiber Oil Catch Can Mishimoto MMOCC-CF $162.95
    California Restricted
    Fits: Universal - Many Applications
    Universal High-Flow Baffled Catch Can Kit Mishimoto MMBCC-HF
    Universal High-Flow Baffled Catch Can Kit Mishimoto MMBCC-HF $239.95
    California Restricted
    Fits: Universal - Many Applications
    Duramax 01-19 Rear 180 Degree Thermostat AcDelco 131-131
    Duramax 01-19 Rear 180 Degree Thermostat AcDelco 131-131 $44.84
    Fits: Duramax 2001-2019
    Duramax Starter Bolt GM 97329632
    Duramax Starter Bolt GM 97329632 $6.56
    Fits: Duramax 2001-2026
    Duramax OE Crankshaft Balancer Bolt GM 97329601
    Duramax OE Crankshaft Balancer Bolt GM 97329601 $19.39
    Fits: Duramax 2001-2024
    Duramax Engine Lower Valve Cover Dowel Pin GM 97014295
    Duramax Engine Lower Valve Cover Dowel Pin GM 97014295 $6.40
    Fits: Duramax 2004.5-2020
    Duramax 01-19 Battery Retainer GM 84109393
    Duramax 01-19 Battery Retainer GM 84109393 $7.77
    Fits: 2500/3500HD Silverado | Sierra 2001-2019
    LLY/LBZ/LMM Duramax Cast Iron Cylinder Head PPE 110100103
    LLY/LBZ/LMM Duramax Cast Iron Cylinder Head PPE 110100103 $1,349.99
    Fits: LLY/LBZ/LMM Duramax 2004.5-2010
    Select Options
    Duramax Internal Oil Cooler Delete Kit PPE 114001000
    Duramax Internal Oil Cooler Delete Kit PPE 114001000 $269.99
    Fits: LB7 | LLY | LBZ | LMM Duramax 2001-2010
    Electronic Control Positive Air Shutdown BD 1036733
    Electronic Control Positive Air Shutdown BD 1036733 $996.95
    Fits: Universal - 4 Inch Intake Systems