Engine Assembly-Cylinder Head & Valvetrain Detail fit your 2021 GMC Sierra 2500 HD 4WD

Currently shopping for

2021 GMC Sierra 2500 HD 4WD

Change Vehicle

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

11516357
BOLT, Engine Valve Rocker Arm Shaft, BOLT,VALVE ROCKER ARM SHAFT(M10X1.5X75,25THD,22.3 O.D., 9.8,7114M)(8.900)
- Require Quantity: 05
- Package Quantity: 5
$15.38 $9.78
5
Add To Cart

12638257
PAD, Valve Stem, PAD,VALVE STEM BRIDGE
- Require Quantity: 16
- Package Quantity: 1
$7.40 $4.69
1
Add To Cart

PIN, Engine Valve Rocker Arm Shaft
22531637
PIN, VALVE ROCKER ARM SHAFT LOCATING(8MM DIAMETER,12MM LONG)(DOWEL)(0.413)
Require Quantity: 04
Package Quantity: 10
$5.11 $3.24
10
Add To Cart
12648428
PIN, VALVE ROCKER ARM SHAFT LOCATING
$4.44 $2.82
1
Add To Cart

12690238
GLOW PLUG, Spark Ignition, GLOW PLUG,(DO NOT USE IF DROPPED OR DAMAGED)
- Require Quantity: 08
- Package Quantity: 1
- Replaced By: 12725202
$40.90 $22.80
1
Add To Cart

PLUG, Engine Cylinder Head

11547206
PLUG, CYL HEAD CORE HOLE(30.221-30.160)(REAR FACE LARGE CUP PLUG)
$4.92 $3.13
1
Add To Cart
11602945
PLUG, CYL HEAD CORE HOLE(PART OF 1)(M16X1.5X15,8 INTAKE HEXAGON)
- Require Quantity: 07
- Package Quantity: 1
$3.95 $2.51
1
Add To Cart

12633926
SEAL, Engine Valve, SEAL,VALVE STEM OIL(SINGLE USE)
- Require Quantity: 32
- Package Quantity: 1
$7.38 $4.69
1
Add To Cart

12633927
SPRING, Engine Valve, SPRING,VALVE
- Require Quantity: 16
- Package Quantity: 1
- Replaced By: 12729741
$7.50 $4.76
1
Add To Cart

12636187
VALVE, Exhaust, VALVE,EXHAUST
- Require Quantity: 08
- Package Quantity: 1
$15.94 $10.12
1
Add To Cart

12636188
VALVE, Intake, VALVE,INTAKE
- Require Quantity: 08
- Package Quantity: 1
- Replaced By: 12734017
$12.55 $7.98
1
Add To Cart

ARM, Engine Valve Rocker
12636189
ARM, INTAKE VALVE ROCKER(INCLUDES 3,4,6)
Require Quantity: 04
Package Quantity: 1
$26.39 $16.77
1
Add To Cart
12636190
ARM, EXHAUST VALVE ROCKER(INCLUDES 3,4,6)
- Require Quantity: 04
- Package Quantity: 1
$26.39 $16.54
1
Add To Cart

12636193
KEY, Valve Stem, KEY,VALVE STEM
- Require Quantity: 32
- Package Quantity: 1
$7.39 $4.69
1
Add To Cart

12636194
RETAINER, Engine Valve, RETAINER,VALVE SPRING
- Require Quantity: 16
- Package Quantity: 1
$4.80 $3.06
1
Add To Cart

12638258
BRIDGE, Valve Stem, BRIDGE,VALVE STEM
- Require Quantity: 16
- Package Quantity: 1
$25.00 $13.05
1
Add To Cart

12648424
SHAFT, Engine Valve Rocker Arm, SHAFT,VALVE ROCKER ARM
$37.90 $24.10
1
Add To Cart

SUPPORT, Engine Valve Rocker Arm Shaft
12648425
SUPPORT, VALVE ROCKER ARM SHAFT(END SUPPORT)
Require Quantity: 02
Package Quantity: 1
$7.62 $4.84
1
Add To Cart
12648426
SUPPORT, VALVE ROCKER ARM SHAFT(INTERMEDIATE SUPPORT)
- Require Quantity: 02
- Package Quantity: 1
$10.58 $6.71
1
Add To Cart
12648427
SUPPORT, VALVE ROCKER ARM SHAFT(CENTER SUPPORT)
$10.58 $6.71
1
Add To Cart

12648429
SPRING, Engine Valve Rocker Arm Shaft, SPRING,VALVE ROCKER ARM SHAFT
- Require Quantity: 04
- Package Quantity: 1
$7.44 $4.76
1
Add To Cart

12702633
HEAD, Engine Cylinder, HEAD,CYL(MACHINING)(INCLUDES 20,24,25,28)
- Require Quantity: 02
- Package Quantity: 1
$344.76 $218.17
1
Add To Cart

12646218
GUIDE, Intake and Exhaust Valve Stem, GUIDE,VALVE(PART OF 1)
- Require Quantity: 16
- Package Quantity: 1

Genuine GM Parts, the Right Choice

GMPartsGiant.com offers the wholesale prices for genuine 2021 GMC Sierra 2500 HD 4WD parts. Parts like Engine Assembly-Cylinder Head & Valvetrain Detail are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 6.6L, 8 Cyl 6.6L Diesel. Model Code: CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, REGULAR CAB 8' BOX 3/4 TON.