Engine Assembly-Cylinder Head & Related Parts fit your 2003 Hummer H2

My Vehicle Change Vehicle

2003 Hummer H2

8 Cyl 6.0L MFI; 4-Speed Automatic Transmission, HMD, 4L60-E/4L65-E, Heavy Duty

My Vehicle Change Vehicle

2003 Hummer H2

8 Cyl 6.0L MFI; 4-Speed Automatic Transmission, HMD, 4L60-E/4L65-E, Heavy Duty

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Brakes, Rear Axle, Propeller Shaft, Wheels, Tires

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Cooling System, Grille, Oil System

Frames, Springs, Shocks, Bumpers

Front Axle, Front Suspension, Steering

Front End Sheet Metal, Heater

Fuel System, Exhaust, Emission System

Maintenance Parts, Fluids, Capacities, Electrical Connectors

Rear Body Structure, Moldings & Trim, Cargo Stowage

Starter, Generator, Ignition, Electrical, Lamps

Transfer Case

Transmission - Automatic

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Recommended

Part No. & Part Description

Price

Part No. &
Part Description

12585673
SEAL, Engine Front Cover & Crankshaft Seal, SEAL,CRANKSHAFT FRONT OIL(PART OF 238)
MSRP: $44.74
$22.55
1
Add To Cart

LIFTER, Engine Valve Lifter
12648846
LIFTER, VALVE(NON-ACTIVE LIFTERS)
Fitting Vehicle Options:
N257(06)(LQ4)
Require Quantity:
16
Package Quantity:
1
Replaced By:
12698945
MSRP: $47.08
$28.45
1
Add To Cart
17122490
LIFTER, VALVE(HYDRAULIC, ROLLER, NON-ACTIVE FUEL MANAGEMENT LIFTER)(COMPLETE ASSEMBLY)
- Fitting Vehicle Options:
  N257(LQ4)
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $58.94
$35.62
1
Add To Cart
12721203
LIFTER, VALVE(HYDRAULIC, ROLLER, NON-ACTIVE FUEL MANAGEMENT LIFTER)(MERCH PACKING OF QTY 4)
- Fitting Vehicle Options:
  N257(LQ4)
MSRP: $176.72
$111.81
1
Add To Cart

SPARK PLUG, Spark Ignition
19299585
SPARK PLUG, GASOLINE ENGINE IGNITION(PLATINUM PLUG)
Fitting Vehicle Options:
N257(LQ4)
Require Quantity:
08
Package Quantity:
1
MSRP: $12.98
$7.24
1
Add To Cart
19354418
SPARK PLUG, GASOLINE ENGINE IGNITION
- Fitting Vehicle Options:
  N257(06)(LQ4)
- Require Quantity:
  08
- Package Quantity:
  1
MSRP: $4.18
$2.33
1
Add To Cart

12637683
GASKET, Engine Camshaft & Valve Rocker Cover, GASKET,VALVE ROCKER ARM COVER(PART OF 204,242)(*KIT1)
- Require Quantity:
  02
- Package Quantity:
  1
MSRP: $30.13
$19.14
1
Add To Cart

BOLT, Engine Cylinder Head
12558840
BOLT, CYL HEAD(M8X1.25X45)
Require Quantity:
10
Package Quantity:
1
MSRP: $5.95
$3.59
1
Add To Cart
11588291
BOLT, CYL HEAD(M11X2.0X155)
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $10.53
$6.35
1
Add To Cart
12560745
BOLT, CYL HEAD(M11X2.0X100.0-6G THREAD)(W/ADHESIVE PATCH)
- Require Quantity:
  04
- Package Quantity:
  5
MSRP: $4.03
$2.43
5
Add To Cart

12633904
GASKET, Engine Front Cover, GASKET,ENGINE FRONT COVER(PART OF 238)
MSRP: $39.78
$26.68
1
Add To Cart

SEAL KIT, Engine Valve

12482063
SEAL KIT, INTAKE VALVE STEM OIL(14.4MM)(CONTAINS 8 SEALS)
MSRP: $58.65
$33.70
1
Add To Cart
12482062
SEAL KIT, EXHAUST VALVE STEM OIL(22.8MM)(CONTAINS 8 SEALS)
MSRP: $64.30
$36.95
1
Add To Cart

12595365
GUIDE, Engine Valve Push Rod Cover, GUIDE,VALVE LIFTER(ACCOMMODATES 4 VALVE LFTRS EACH,WITH SIDE GROOVES)
- Require Quantity:
  04
- Package Quantity:
  1
MSRP: $15.43
$9.81
1
Add To Cart

12681275
ARM, Engine Valve Rocker, ARM,VALVE ROCKER
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $20.09
$12.14
1
Add To Cart

12573337
CAP, Engine Oil Filler, CAP,OIL FILLER(SAE 5W30, NON-VENTED, SEAL)(INCLUDES 245)
MSRP: $20.44
$10.83
1
Add To Cart

COVER, Engine Valve Rocker & Camshaft
12570427
COVER, VALVE ROCKER ARM(INCLUDES 202,205)(INCLUDES:COVER,GASKET,BOLT,DEFLECTOR,FITTING)(REMOVE PCV VALVE AND CONNECT HOSE TO VALVE COVER PORTION WHEN USING TO REPLACE PART NUMBER-12561820)
Location:
Driver Side
MSRP: $191.30
$121.03
1
Add To Cart
12582224
COVER, VALVE ROCKER ARM(INCLUDES 202,205)(INCLUDES:COVER,GASKET,BOLT,CONNECTOR,FITTING,BAFFLE,CAP)(WHEN REPLACING COVER, TRIM EXISTING PCV HOSE TO FIT OR USE PCV HOSE 12582227)(IF REPLACING 2-PORTION VALVE COVER, PLUG LOOSE PCV HOSE.)
- Location:
  Passenger Side
MSRP: $156.66
$99.55
1
Add To Cart

12577215
BOLT, Engine Camshaft & Valve Rocker Cover, BOLT,VALVE ROCKER ARM COVER(M6.0X1.0)(W/GROMMET,SLEEVE)
- Require Quantity:
  08
- Package Quantity:
  1
MSRP: $7.29
$4.63
1
Add To Cart

10238852
ROD, Engine Valve Push Rod, ROD,VALVE PUSH
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $28.64
$17.31
1
Add To Cart

12574660
TUBE, Engine Crankcase Ventilation, TUBE,PCV(INCLUDE VALVE)
MSRP: $44.56
$24.51
1
Add To Cart

12589227
GASKET, Engine Cylinder Head, GASKET,CYL HEAD(NEW HEAD BLTS REQ'D WHEN HEAD IS REMOVED)(*KIT1)
- Require Quantity:
  02
- Package Quantity:
  1
MSRP: $76.61
$48.69
1
Add To Cart

12552203
SUPPORT, Engine Valve Adjusting, SUPPORT,VALVE ROCKER ARM PIVOT
- Require Quantity:
  02
- Package Quantity:
  1
MSRP: $78.49
$49.89

12574386
TUBE, Engine Crankcase, TUBE,OIL FILLER
MSRP: $83.19
$47.81
1
Add To Cart

12554211
STUD, Ignition Coil Mounting, STUD,IGNITION COIL BRACKET(HEX FLANGED HEAD,M6X1X18)(M6X1X18.5X14)(3.330)
- Require Quantity:
  10
- Package Quantity:
  1
MSRP: $13.76
$7.29
1
Add To Cart

10166345
KEY, Valve Stem, KEY,VALVE STEM
- Require Quantity:
  32
- Package Quantity:
  10
MSRP: $5.03
$3.03
10
Add To Cart

12706568
SPRING, Engine Valve, SPRING,VALVE
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $7.20
$4.57
1
Add To Cart

PLUG, Engine Cylinder Head
11610259
PLUG, CYL HEAD CORE HOLE(M12X1.5X21.2)(HEXAGON,SOCKET)
Fitting Vehicle Options:
N257(06)(LQ4)
MSRP: $11.14
$6.72
1
Add To Cart
11562126
PLUG, CYL HEAD CORE HOLE(CUP,32.03X7.88X1.27, S30400 STAINLESS STEEL PER SAE J405.)
- Fitting Vehicle Options:
  N257(06)
- Require Quantity:
  04
- Package Quantity:
  10
MSRP: $4.17
$2.65
10
Add To Cart

VALVE, Exhaust
12563064
VALVE, EXHAUST(STD)
Require Quantity:
08
Package Quantity:
1
Replaced By:
12694167
MSRP: $36.38
$21.98
1
Add To Cart
12562954
VALVE, EXHAUST(0.015" OVERSIZE)
- Require Quantity:
  08
- Package Quantity:
  1

24100002
SEAL, Engine Crankcase, SEAL,OIL FILLER TUBE(O RING)(27.94MM INNER DIAMETER)(SIZE #320)
- Require Quantity:
  02
- Package Quantity:
  5
MSRP: $5.33
$2.67
5
Add To Cart

24100002
SEAL, Engine Oil Filler, SEAL,OIL FILLER CAP(O RING)(PART OF 246)(27.94MM INNER DIAMETER)(SIZE #320)(1.745)
- Require Quantity:
  02
- Package Quantity:
  5
MSRP: $5.33
$2.67
5
Add To Cart

10198949
GROMMET, Engine Crankcase, GROMMET,PCV VALVE(PART OF 204,242)
MSRP: $11.50
$7.30
1
Add To Cart

12551163
BOLT, Engine Valve Lifter, BOLT,VALVE LIFTER GUIDE(M6X1.0X19)
- Require Quantity:
  04
- Package Quantity:
  10
MSRP: $5.70
$3.45
10
Add To Cart

12556932
HOSE, Engine Crankcase Ventilation, HOSE,PCV
MSRP: $62.34
$33.04
1
Add To Cart

12560961
BOLT, Engine Valve Rocker Arm Shaft, BOLT,VALVE ROCKER ARM PIVOT SUPPORT(M8X1.25X52.5)
- Require Quantity:
  16
- Package Quantity:
  1
MSRP: $8.74
$5.55
1
Add To Cart

12570326
PIN, Engine Cylinder Head, PIN,CYL HEAD LOCATING
- Require Quantity:
  04
- Package Quantity:
  1
MSRP: $7.20
$4.57
1
Add To Cart

12562319
HEAD, Engine Cylinder, HEAD,CYL(PARTIAL)(INCLUDES 218)(INCLUDES HEAD,GUIDES,SEATS,PLUG)
- Require Quantity:
  02
- Package Quantity:
  1
MSRP: $731.30
$460.62
1
Add To Cart

VALVE, Intake
12563063
VALVE, INTAKE(STD)
Require Quantity:
08
Package Quantity:
1
MSRP: $38.28
$23.13
1
Add To Cart
12562952
VALVE, INTAKE(0.015" OVERSIZE)
- Require Quantity:
  08
- Package Quantity:
  1
MSRP: $175.48
$44.04
1
Add To Cart

12575742
COVER, Engine Fuel Intake Manifold, COVER,ENGINE BLOCK VALLEY
MSRP: $502.39
$317.86

WIRE, Spark Plug or Coil
12192133
WIRE, SPARK PLUG(10.5IN)(7MM DIAMETER, 10.5"LONG)(W/O HEAT SHIELD)(IGNITION CABLE)(USED W/COIL STAMPED 12558693)
Require Quantity:
08
Package Quantity:
1
MSRP: $25.62
$13.58
1
Add To Cart
19351911
WIRE, SPARK PLUG(DELPHI, 9.2IN)(7MM DIAMETER, 9.2"LONG)(W/O HEAT SHIELD)(IGNITION CABLE)(USED WITH COIL LABELED 190052)
- Require Quantity:
  08
- Package Quantity:
  1

12561243
COVER, Engine Front Cover, COVER,ENGINE FRONT(INCLUDES 236,237,239)(INCLUDES COVER,SEAL,GASKET,BOLT)
- Replaced By:
  12633906
MSRP: $167.50
$96.24
1
Add To Cart

GASKET KIT, Engine Cylinder Head

89017253
GASKET KIT, CYL HEAD(EXCEPT:CYL HEAD BOLTS)(INCLUDES 205,230)(INCLUDE HEAD,INTKE & EXHAUST MANIFOLD GASKETS & COOLANT AIR BLEED PIPE SEALS)(INCLUDES GASKETS,SEAL)
MSRP: $456.64
$288.91
1
Add To Cart
88894351
GASKET KIT, CYL HEAD(INCLUDES:CYL HEAD BOLTS)(INCLUDES 205,230)
- Require Quantity:
  02
- Package Quantity:
  1

10166344
CAP, Engine Valve Spring, CAP,VALVE SPRING(EXHAUST)
- Require Quantity:
  16
- Package Quantity:
  1

11515767
BOLT, HEX FLANGED HEAD,M10X1.5X35,32THD,22.3 O.D.,MACHINE,10.9,7114M(ENGINE LIFT BRACKET)(TOGETHER WITH 12345493)
- Require Quantity:
  02
- Package Quantity:
  10
MSRP: $1.14
$0.74
10
Add To Cart

11515758
BOLT, HEX FLANGED HEAD,M8X1.25X30,28THD,18 O.D.,MACHINE POINT,10.9,7114M(PART OF 238)
- Require Quantity:
  08
- Package Quantity:
  10
MSRP: $1.81
$1.15
10
Add To Cart

Genuine GM Parts, the Right Choice

GMPartsGiant.com offers the wholesale prices for genuine 2003 Hummer H2 parts. Parts like Engine Assembly-Cylinder Head & Related Parts are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 6.0L. Model Code: H2 HUMMER.