Engine Assembly-Cylinder Head & Related Parts fit your 2003 Chevrolet Trailblazer EXT 4WD

Currently shopping for

2003 Chevrolet Trailblazer EXT 4WD

Change Vehicle

Vehicle Options

4-Speed Automatic Transmission, 4L60-E, Electronic; Trailblazer 4 Door EXT

Vehicle Options

4-Speed Automatic Transmission, 4L60-E, Electronic; Trailblazer 4 Door EXT

Categories Close X

Currently selected

Engine

Other Categories

Body Mounting, Air Conditioning, Audio/Entertainment

Brakes

Brakes, Rear Axle, Propeller Shaft, Wheels, Tires

Cab And Body Structure, Mirrors, Doors, Trim, Seat Belts, Wipers

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

Parts Questions

Sort by:

Recommended

Part No. & Part Description

Price & Qty.

Part No. &
Part Description

12585673
SEAL, Engine Front Cover & Crankshaft Seal, SEAL,CRANKSHAFT FRONT OIL(PART OF 238)
$45.94 $15.04
1
Add To Cart

12648846
LIFTER, Engine Valve Lifter, LIFTER,VALVE(NON-ACTIVE LIFTERS)
- Require Quantity: 16
- Package Quantity: 1
- Replaced By: 12698945
$49.82 $30.10
1
Add To Cart

SPARK PLUG, Spark Ignition
19299585
SPARK PLUG, GASOLINE ENGINE IGNITION(PLATINUM PLUG)
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 08
Package Quantity: 1
$13.20 $7.36
1
Add To Cart
12681663
SPARK PLUG, GASOLINE ENGINE IGNITION(SPARK PLUG IS PRE-GAPPED,DO NOT CHANGE)(IRIDIUM)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 06
- Package Quantity: 1
$15.80 $8.81
1
Add To Cart
19354418
SPARK PLUG, GASOLINE ENGINE IGNITION
- Fitting Vehicle Options: ST155,158(06)(LM4)
- Require Quantity: 08
- Package Quantity: 1
$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
$34.05 $21.63
1
Add To Cart

BOLT, Engine Cylinder Head
12558840
BOLT, CYL HEAD(M8X1.25X45)
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 10
Package Quantity: 1
$5.95 $3.59
1
Add To Cart
11588291
BOLT, CYL HEAD(M11X2.0X155)
- Fitting Vehicle Options: ST1(LM4)
- Require Quantity: 16
- Package Quantity: 1
$10.53 $6.35
1
Add To Cart
12560745
BOLT, CYL HEAD(M11X2.0X100.0-6G THREAD)(W/ADHESIVE PATCH)
- Fitting Vehicle Options: ST1(LM4)
- Require Quantity: 04
- Package Quantity: 5
$6.28 $3.78
5
Add To Cart
11609709
BOLT, CYL HEAD(M11X2X145, 34 THREAD,25 OUTSIDE DIAMETER, 10.9,)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 14
- Package Quantity: 10
$7.44 $4.73
10
Add To Cart
11519038
BOLT, CYL HEAD(BOLT-HEX FLANGED HEAD,M6X1X30,24 THREAD,13.2 OUTSIDE DIAMETER,10.9,GMW3359)(M6X1X30)(W/ADHESIVE ON THREADS)(8.900)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 02
- Package Quantity: 1
$0.58 $0.37
1
Add To Cart
11519306
BOLT, CYL HEAD(BOLT-HEX FLANGED HEAD,M6X1X88.3,17 THREAD,14.2 OUTSIDE DIAMETER,10.9,4435M,MACHINE,6194M,HEADER POINT)
- Fitting Vehicle Options: ST1(LL8)
$12.37 $7.86
1
Add To Cart

12633904
GASKET, Engine Front Cover, GASKET,ENGINE FRONT COVER(PART OF 238)
$47.74 $28.86
1
Add To Cart

SEAL KIT, Engine Valve

12482063
SEAL KIT, INTAKE VALVE STEM OIL(SEPARATE SEAL AND(RUBBER COATED) SPRING SHIM)(14.4MM)(CONTAINS 8 SEALS)
$60.23 $36.39
1
Add To Cart
12482062
SEAL KIT, EXHAUST VALVE STEM OIL(22.8MM)(CONTAINS 8 SEALS)
$66.04 $37.95
1
Add To Cart

ARM, Engine Valve Rocker
24100294
ARM, VALVE ROCKER
Fitting Vehicle Options: ST1(LL8)
Require Quantity: 24
Package Quantity: 1
$8.02 $5.10
1
Add To Cart
12681275
ARM, VALVE ROCKER
- Fitting Vehicle Options: ST1(LM4)
- Require Quantity: 16
- Package Quantity: 1
$22.71 $13.72
1
Add To Cart

12595365
GUIDE, Engine Valve Push Rod Cover, GUIDE,VALVE LIFTER(ACCOMMODATES 4 VALVE LFTRS EACH,WITH SIDE GROOVES)
$17.43 $10.54
1
Add To Cart

CAP, Engine Oil Filler
12573337
CAP, OIL FILLER(SAE 5W30, NON-VENTED, SEAL)(INCLUDES 900)
Fitting Vehicle Options: ST1(LL8)
$21.00 $11.13
1
Add To Cart
12573337
CAP, OIL FILLER(SAE 5W30, NON-VENTED, SEAL)(INCLUDES 245)
- Fitting Vehicle Options: ST1(LM4)
$21.00 $11.13
1
Add To Cart

12615873
VALVE, Engine Camshaft, VALVE,CAMSHAFT POSITION ACTUATOR SOLENOID(MATING CONNECT W/LEADS USE 13580114)
$88.28 $56.11

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
Fitting Vehicle Options: ST158(06)(LM4)
$202.36 $128.03
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
- Fitting Vehicle Options: ST1(LM4)
$160.89 $102.23
1
Add To Cart
12591994
COVER, CAMSHAFT(INCLUDES 519,520,905,907)(HAS CRANKCASE VENTILATION SYSTEM/NO PCV VALVE)
- Fitting Vehicle Options: ST1(LL8)

12572638
ADJUSTER, Engine Valve Lifter, ADJUSTER,HYDRAULIC VALVE LASH
- Require Quantity: 24
- Package Quantity: 1
- Replaced By: 12686787
$23.17 $13.99
1
Add To Cart

12577215
BOLT, Engine Camshaft & Valve Rocker Cover, BOLT,VALVE ROCKER ARM COVER(M6.0X1.0)(W/GROMMET,SLEEVE)
- Require Quantity: 04
- Package Quantity: 1
$7.48 $4.75
1
Add To Cart

10238852
ROD, Engine Valve Push Rod, ROD,VALVE PUSH
- Require Quantity: 16
- Package Quantity: 1
$30.29 $18.31
1
Add To Cart

12574660
TUBE, Engine Crankcase Ventilation, TUBE,PCV(INCLUDE VALVE)
$64.90 $34.40
1
Add To Cart

12552203
SUPPORT, Engine Valve Adjusting, SUPPORT,VALVE ROCKER ARM PIVOT
- Require Quantity: 02
- Package Quantity: 1
$80.61 $51.23
1
Add To Cart

12584079
SENSOR, Distributor (also Knock Sensor), SENSOR,CAMSHAFT POSITION(W/ANGLE CONNECTOR)(INCLUDES 909)
$132.06 $69.99
1
Add To Cart

12574386
TUBE, Engine Crankcase, TUBE,OIL FILLER
$85.44 $49.10
1
Add To Cart

PLUG, Engine Cylinder Head
1647544
PLUG, CYL HEAD ACCESS HOLE(M24X1.5X12)(ROUND HEAD,INTAKE HEXAGON,W/SEAL,NYLON)(0.034)
Fitting Vehicle Options: ST1(LL8)
Require Quantity: 02
Package Quantity: 1
$14.42 $10.25
1
Add To Cart
11610259
PLUG, CYL HEAD CORE HOLE(M12X1.5X21.2)(HEXAGON,SOCKET)
- Fitting Vehicle Options: ST1(LM4)
$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: ST1(LM4)
- Require Quantity: 02
- Package Quantity: 10
$4.17 $2.65
10
Add To Cart
11562125
PLUG, CYL HEAD WATER JACKET HOLE(22.6 OUTSIDE DIAMETER)(3.675)
- Fitting Vehicle Options: ST1(LL8)
$5.86 $3.72

12554211
STUD, Ignition Coil Mounting, STUD,IGNITION COIL BRACKET(HEX FLANGED HEAD,M6X1X18)(M6X1X18.5X14)(3.330)
- Require Quantity: 10
- Package Quantity: 1
$14.14 $7.49
1
Add To Cart

KEY, Valve Stem
10166345
KEY, VALVE STEM
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 16
Package Quantity: 10
$5.17 $3.28
10
Add To Cart
90354648
KEY, VALVE STEM
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 48
- Package Quantity: 1
$7.03 $4.46
1
Add To Cart

SPRING, Engine Valve
12706568
SPRING, VALVE
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 16
Package Quantity: 1
$7.39 $4.63
1
Add To Cart
12596078
SPRING, VALVE
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 24
- Package Quantity: 1
$0.42 $0.27
1
Add To Cart

VALVE, Exhaust
12563064
VALVE, EXHAUST(STD)
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 08
Package Quantity: 1
Replaced By: 12694167
$37.36 $22.58
1
Add To Cart
12569015
VALVE, EXHAUST(.075 OVERSIZE)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 12
- Package Quantity: 1
$132.26 $64.10
1
Add To Cart
24576975
VALVE, EXHAUST(STD)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 12
- Package Quantity: 1
$8.42 $6.75
1
Add To Cart
12562954
VALVE, EXHAUST(0.015" OVERSIZE)
- Fitting Vehicle Options: ST1(LM4)
- Require Quantity: 08
- Package Quantity: 1

SEAL, Engine Oil Filler
24100002
SEAL, OIL FILLER CAP(O RING)(PART OF 521)(27.94MM INNER DIAMETER)(SIZE #320)(1.745)
Require Quantity: 02
Package Quantity: 5
$5.47 $2.72
5
Add To Cart
24100002
SEAL, OIL FILLER CAP(O RING)(PART OF 246)(27.94MM INNER DIAMETER)(SIZE #320)(1.745)
- Require Quantity: 02
- Package Quantity: 5
$5.47 $2.72
5
Add To Cart

24100002
SEAL, Engine Crankcase, SEAL,OIL FILLER TUBE(O RING)(27.94MM INNER DIAMETER)(SIZE #320)
- Require Quantity: 02
- Package Quantity: 5
$5.47 $2.72
5
Add To Cart

10198949
GROMMET, Engine Crankcase, GROMMET,PCV VALVE(PART OF 204,242)
$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
$6.82 $4.34
10
Add To Cart

12556932
HOSE, Engine Crankcase Ventilation, HOSE,PCV
$82.66 $34.72
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
$9.27 $5.89
1
Add To Cart

VALVE, Intake
12564494
VALVE, INTAKE(STD)
Fitting Vehicle Options: ST1(LM4)
Require Quantity: 08
Package Quantity: 1
$34.46 $20.82
1
Add To Cart
12569014
VALVE, INTAKE(.075 OVERSIZE)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 12
- Package Quantity: 1
$125.96 $62.45
1
Add To Cart
24576974
VALVE, INTAKE(STD)
- Fitting Vehicle Options: ST1(LL8)
- Require Quantity: 12
- Package Quantity: 1
$21.19 $13.05
1
Add To Cart

12570326
PIN, Engine Cylinder Head, PIN,CYL HEAD LOCATING
- Require Quantity: 04
- Package Quantity: 1
$7.39 $4.46
1
Add To Cart

12575329
GASKET, Engine Cylinder Head, GASKET,CYL HEAD(*KIT1)
- Require Quantity: 02
- Package Quantity: 1
$69.23 $44.01
1
Add To Cart

12575742
COVER, Engine Fuel Intake Manifold, COVER,ENGINE BLOCK VALLEY
$515.95 $326.44

PLUG, Cylinder Head Valve Seat

24577307
PLUG, CYL HEAD OIL GALLERY(FRONT)
$12.47 $7.93
1
Add To Cart
11609916
PLUG, CYL HEAD OIL GALLERY(REAR)(M14X1.5X21.5)
- Require Quantity: 02
- Package Quantity: 1
$10.88 $6.91
1
Add To Cart

GASKET KIT, Engine Cylinder Head
89017252
GASKET KIT, CYL HEAD(EXCEPT:CYL HEAD BOLTS)(INCLUDES 205,230)(INCLUDES GASKET,CYL HEAD,INTAKE MANIFOLD,EXHAUST MANIFOLD,VALVE ROCKER COVER,SEAL)
Fitting Vehicle Options: ST1(LM4)
$317.38 $200.80
1
Add To Cart
19368586
GASKET KIT, CYL HEAD(INCLUDES 205,230)(INCLUDES GASKET,CYL HEAD,INTAKE MANIFOLD,EXHAUST MANIFOLD,VALVE ROCKER COVER,SEAL)
- Fitting Vehicle Options: ST1(LM4)
$453.23 $260.41
1
Add To Cart
12482715
GASKET KIT, CYL HEAD(INCLUDES 201,209,520,905)(HAS CRANKCASE VENTILATION SYSTEM/NO PCV VALVE)
- Fitting Vehicle Options: ST1(LL8)

12561243
COVER, Engine Front Cover, COVER,ENGINE FRONT(INCLUDES 236,237,239)(INCLUDES COVER,SEAL,GASKET,BOLT)
- Replaced By: 12633906
$175.87 $101.05
1
Add To Cart

12596994
SEAL, Engine Valve, SEAL,VALVE STEM OIL(*KIT2)
- Require Quantity: 24
- Package Quantity: 1
$14.54 $9.24
1
Add To Cart

19244715
SENSOR, Computer Control Sensors, SENSOR,ENGINE COOLANT TEMPERATURE(1.150)
$81.56 $39.28
1
Add To Cart

19244715
SENSOR, Coolant Temperature (Engine Unit), SENSOR,ENGINE COOLANT TEMPERATURE
$81.56 $39.28
1
Add To Cart

CAMSHAFT, Engine

19301652
CAMSHAFT, INTAKE(REMANUFACTURED-NOT FOR SALE WHERE IMPORTS ARE RESTRICTED)
$377.56 $278.31
1
Add To Cart
24577279
CAMSHAFT, EXHAUST(MACHINING)
$441.22 $279.17

HEAD, Engine Cylinder
12578925
HEAD, CYL(INCLUDES 218)(EXCEPT VALVES)
Fitting Vehicle Options: ST1(LM4,M30)
Require Quantity: 02
Package Quantity: 1
$854.96 $538.50
19207470
HEAD, CYL(MACHINING)(INCLUDES VALVES,VALVE SPRINGS, KEYS AND RETAINERS)(INCLUDES 224,225,901,902,904)(REMANUFACTURED-NOT FOR SALE WHERE IMPORTS ARE RESTRICTED)
- Fitting Vehicle Options: ST1(LL8)

10166344
CAP, Engine Valve Spring, CAP,VALVE SPRING(EXHAUST)
- Require Quantity: 16
- Package Quantity: 1
$12.60
1
Add To Cart

12569484
PLUG, Emission System, PLUG,SECONDARY AIR INJECTION PIPE HOLE(12.7MM)
$6.51 $4.14
1
Add To Cart

12570816
BOLT, Engine Camshaft & Balance Shaft Front, BOLT,CAMSHAFT BEARING CAP(PART OF 200)(M6X1.0X39.2)
- Require Quantity: 29
- Package Quantity: 1
$9.67 $6.14
1
Add To Cart

12615912
INSULATOR, Engine Camshaft & Valve Rocker Cover, INSULATOR,CAMSHAFT COVER BOLT(PART OF 518)(INCLUDES BOLT,GROMMET)
- Require Quantity: 21
- Package Quantity: 1
$21.92 $13.93
1
Add To Cart

89017729
GASKET KIT, Engine Camshaft & Valve Rocker Cover, GASKET KIT,CAMSHAFT COVER(INCLUDES 520,905)
$39.64 $23.95
1
Add To Cart

89018055
WIRE, Spark Plug or Coil, WIRE,SPARK PLUG(INDIVIDUAL LEAD, BLACK CABLE. USED TO SERVICE BLUE PRODUCT WIRES)
- Require Quantity: 08
- Package Quantity: 1
$44.24 $23.45
1
Add To Cart

90537243
RETAINER, Engine Valve, RETAINER,VALVE SPRING
- Require Quantity: 24
- Package Quantity: 5
$8.60 $5.46
5
Add To Cart

12572633
BRACKET, Engine Lift, BRACKET,ENGINE LIFT FRONT

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
$1.22 $0.75
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
$1.86 $1.12
10
Add To Cart

11562426
BOLT, HEX FLANGED HEAD,M6X1X25,18 THREAD,14.2 OUTSIDE DIAMETER, 10.9 STEEL GMW3359(CAMSHAFT POSITION SENSOR)
$10.85 $6.90
1
Add To Cart

11517518
BOLT, HEX FLANGED HEAD,M6X1X20,17.9 THREAD,14.2 O.D.,9.8,TIN ZINC(CAMSHAFT POSITION ACTUATOR)
$12.60
1
Add To Cart

11504978
NUT, U-TYPE M6X1 PNLS 13.5 DEEP ZINC ORGANIC(PART OF 518)
- Require Quantity: 02
- Package Quantity: 1
$4.72 $3.00
1
Add To Cart

11562004
BOLT, HEXAGON W/FLAT WASHER,M10X1.5X30,19 THREAD,20 OUTSIDE DIAMETER,8.8,GMW3200,MACHINE,M-POINT(ENGINE LIFT FRONT BRACKET)
- Require Quantity: 03
- Package Quantity: 10
$5.83 $3.70

Genuine GM Parts, the Right Choice

GMPartsGiant.com offers the wholesale prices for genuine 2003 Chevrolet Trailblazer EXT 4WD 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: 6 Cyl 4.2L, 8 Cyl 5.3L. Model Code: 4 DOOR EXT.