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    Home 2025 GMC Sierra 3500 HD Pro 6.6L V8 - Flex Engine

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    2025 GMC Sierra 3500 HD

    Pro 6.6L V8 - Flex

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    Engine for 2025 GMC Sierra 3500 HD

    Diagram 1 1. Oil Cooler Diagram 2 2. Exhaust Valve Diagram 3 3. Control Valve 4. Engine Camshaft Seal
    Engine for 2025 GMC Sierra 3500 HD #0
    No.
    Part # / Description / Price
    Price
    N/A
    12738896 - Engine: Oil Cooler for GM Image
    Oil Cooler
    12738896
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Assembly. 6.6L diesel, lower components, fm 11/30/2023.
    MSRP $677.12 CAD
    $409.71 CAD
    MSRP $677.12 CAD
    $409.71 CAD
    N/A
    12745424 - Engine: Engine for GM Image
    Engine 1
    12745424
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD.
    MSRP $6,896.53 CAD
    $6,068.95 CAD
    MSRP $6,896.53 CAD
    $6,068.95 CAD
    N/A
    85043935 - Engine: Front Mount for GM Image
    Motor Mount
    85043935
    GM GM
    Description: 6.6L diesel. Silverado, Sierra 3500 HD. Right. Silverado, Sierra 2500 HD.
    MSRP $156.56 CAD
    $105.82 CAD
    MSRP $156.56 CAD
    $105.82 CAD
    1
    12705857 - Engine: Cylinder Head for GM Image
    Cylinder Head 1
    12705857
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $998.02 CAD
    $645.40 CAD
    MSRP $998.02 CAD
    $645.40 CAD
    2
    12688186 - Engine: Head Gasket for GM Image
    Head Gasket
    12688186
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $81.34 CAD
    $57.38 CAD
    MSRP $81.34 CAD
    $57.38 CAD
    3
    12723317 - Engine: Valve Cover for GM Image
    Valve Cover
    12723317
    GM GM
    Notes: Includes: Gasket.
    MSRP $170.70 CAD
    $113.38 CAD
    MSRP $170.70 CAD
    $113.38 CAD
    3
    12727455 - Engine: Valve Cover for GM Image
    Valve Cover
    12727455
    GM GM
    Notes: Includes: Gasket.
    MSRP $151.38 CAD
    $102.35 CAD
    MSRP $151.38 CAD
    $102.35 CAD
    4
    12619787 - Engine: Valve Cover Gasket for GM Image
    Valve Cover Gasket
    12619787
    GM GM
    MSRP $8.45 CAD
    $6.24 CAD
    MSRP $8.45 CAD
    $6.24 CAD
    5
    12703404 - Engine: Intake Valve for GM Image
    Intake Valve
    12703404
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $33.37 CAD
    $24.53 CAD
    MSRP $33.37 CAD
    $24.53 CAD
    6
    12733470 - Engine: Exhaust Valve for GM Image
    Exhaust Valve
    12733470
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD.
    MSRP $50.46 CAD
    $35.62 CAD
    MSRP $50.46 CAD
    $35.62 CAD
    7
    12689007 - Engine: Valve Seals for GM Image
    Valve Seals
    12689007
    GM GM
    MSRP $8.44 CAD
    $6.16 CAD
    MSRP $8.44 CAD
    $6.16 CAD
    7
    12689006 - Engine: Valve Seals for GM Image
    Valve Seals
    12689006
    GM GM
    MSRP $7.51 CAD
    $5.56 CAD
    MSRP $7.51 CAD
    $5.56 CAD
    8
    12728733 - Engine: Valve Springs for GM Image
    Valve Springs
    12728733
    GM GM
    Description: Express, savana. Tahoe. Express 3500. Savana 3500. Express 2500. Suburban. Sierra, silverado. Savana 2500. Yukon XL.
    MSRP $7.58 CAD
    $5.54 CAD
    MSRP $7.58 CAD
    $5.54 CAD
    9
    10166344 - Engine: Valve Retainer for GM Image
    Valve Retainer
    10166344
    GM GM
    MSRP $9.34 CAD
    $6.85 CAD
    MSRP $9.34 CAD
    $6.85 CAD
    10
    10166345 - Engine: Valve Keeper for GM Image
    Valve Keeper
    10166345
    GM GM
    MSRP $5.37 CAD
    $3.93 CAD
    MSRP $5.37 CAD
    $3.93 CAD
    11
    12619829 - Engine: Rocker Arms for GM Image
    Rocker Arms
    12619829
    GM GM
    MSRP $26.47 CAD
    $19.46 CAD
    MSRP $26.47 CAD
    $19.46 CAD
    12
    12619828 - Engine: Push Rods for GM Image
    Push Rods
    12619828
    GM GM
    MSRP $5.85 CAD
    $4.30 CAD
    MSRP $5.85 CAD
    $4.30 CAD
    13
    12698945 - Engine: Valve Lifters for GM Image
    Valve Lifters
    12698945
    GM GM
    MSRP $64.89 CAD
    $38.98 CAD
    MSRP $64.89 CAD
    $38.98 CAD
    14
    12672469 - Engine: Camshaft for GM Image
    Engine Camshaft
    12672469
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $278.99 CAD
    $185.33 CAD
    MSRP $278.99 CAD
    $185.33 CAD
    15
    12679049 - Engine: Camshaft Bearings for GM Image
    Camshaft Bearings
    12679049
    GM GM
    Description: Escalade ESV. Express 2500. Position# 1 & 5. Express 3500. Silverado, Sierra 2500 HD. No. 2 & 4. Savana 2500. Savana 3500. Silverado, Sierra 3500 HD. Yukon XL.
    MSRP $129.24 CAD
    $87.38 CAD
    MSRP $129.24 CAD
    $87.38 CAD
    16
    12634614 - Engine: Front Crank Seal for GM Image
    Engine Crankshaft Seal
    12634614
    GM GM
    MSRP $12.72 CAD
    $9.35 CAD
    MSRP $12.72 CAD
    $9.35 CAD
    18
    12691692 - Engine: Front Cover for GM Image
    Engine Timing Cover
    12691692
    GM GM
    MSRP $142.43 CAD
    $96.31 CAD
    MSRP $142.43 CAD
    $96.31 CAD
    19
    12713934 - Engine: Crankshaft Gear for GM Image
    Crankshaft Gear
    12713934
    GM GM
    MSRP $80.21 CAD
    $56.59 CAD
    MSRP $80.21 CAD
    $56.59 CAD
    20
    12630107 - Engine: Tensioner for GM Image
    Tensioner
    12630107
    GM GM
    MSRP $57.35 CAD
    $40.46 CAD
    MSRP $57.35 CAD
    $40.46 CAD
    21
    12646387 - Engine: Timing Chain for GM Image
    Timing Chain
    12646387
    GM GM
    MSRP $139.34 CAD
    $94.17 CAD
    MSRP $139.34 CAD
    $94.17 CAD
    22
    12689342 - Engine: Actuator for GM Image
    Engine Timing Camshaft Sprocket
    12689342
    GM GM
    MSRP $215.77 CAD
    $143.33 CAD
    MSRP $215.77 CAD
    $143.33 CAD
    23
    12746597 - Engine: Control Valve for GM Image
    Valve
    12746597
    GM GM
    Description: Tahoe. Savana 2500. Express 2500. Suburban. Express 3500. Savana 3500.
    MSRP $54.24 CAD
    $38.27 CAD
    MSRP $54.24 CAD
    $38.27 CAD
    24
    12675031 - Engine: Solenoid for GM Image
    Engine Variable Valve Timing (Vvt) Solenoid
    12675031
    GM GM
    MSRP $54.25 CAD
    $38.28 CAD
    MSRP $54.25 CAD
    $38.28 CAD
    25
    12735507 - Engine: Piston Rings for GM Image
    F (S)Ring Kit
    12735507
    GM GM
    Notes: Includes: One Ring Set For One Piston.
    MSRP $186.30 CAD
    $123.76 CAD
    MSRP $186.30 CAD
    $123.76 CAD
    25
    12735470 - Engine: Piston Rings for GM Image
    Ring Kit
    12735470
    GM GM
    Notes: Includes: One Ring Set For One Piston.
    MSRP $66.09 CAD
    $46.60 CAD
    MSRP $66.09 CAD
    $46.60 CAD
    26
    12699527 - Engine: Piston for GM Image
    Engine Piston
    12699527
    GM GM
    Notes: Includes: Pin And Retainer.
    Description: Silverado, Sierra 2500 HD. Standard. Right. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500. Incl.Piston Pin.
    MSRP $131.82 CAD
    $89.11 CAD
    MSRP $131.82 CAD
    $89.11 CAD
    26
    12699530 - Engine: Piston for GM Image
    Piston
    12699530
    GM GM
    Notes: Includes: Pin And Retainer.
    Description: Silverado, Sierra 2500 HD. Oversized 0.5mm. Left. Silverado, Sierra 3500 HD. Express 2500. O/s 0.5mm. Express 3500. Savana 2500. Savana 3500.
    MSRP $168.01 CAD
    $113.57 CAD
    MSRP $168.01 CAD
    $113.57 CAD
    26
    12699529 - Engine: Piston for GM Image
    Engine Piston
    12699529
    GM GM
    Notes: Includes: Pin And Retainer.
    Description: Silverado, Sierra 2500 HD. Standard. Left. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500. Incl.Piston Pin.
    MSRP $130.53 CAD
    $88.24 CAD
    MSRP $130.53 CAD
    $88.24 CAD
    26
    12699528 - Engine: Piston for GM Image
    Piston
    12699528
    GM GM
    Notes: Includes: Pin And Retainer.
    Description: Silverado, Sierra 2500 HD. Oversized 0.5mm. Right. Silverado, Sierra 3500 HD. Express 2500. O/s 0.5mm. Express 3500. Savana 2500. Savana 3500.
    MSRP $168.01 CAD
    $113.57 CAD
    MSRP $168.01 CAD
    $113.57 CAD
    27
    12675746 - Engine: Connecting Rod for GM Image
    Connecting Rod
    12675746
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $111.40 CAD
    $75.30 CAD
    MSRP $111.40 CAD
    $75.30 CAD
    28
    12735504 - Engine: Connecting Rod Bearing for GM Image
    Connecting Rod Bearing
    12735504
    GM GM
    Notes: Includes: Upper & Lower Bearing For One Rod.
    Description: Escalade ESV. Express 2500. Express 3500. Savana 2500. Savana 3500. Yukon XL. 6.2l. Corvette. Tahoe. 6.2l. Suburban. 6.2l. CTS-v.
    MSRP $16.58 CAD
    $12.19 CAD
    MSRP $16.58 CAD
    $12.19 CAD
    29
    12729655 - Engine: Main Bearings for GM Image
    Main Bearings
    12729655
    GM GM
    Notes: Includes: Upper, Lower & Thrust Bearing.
    MSRP $103.55 CAD
    $70.01 CAD
    MSRP $103.55 CAD
    $70.01 CAD
    30
    12708884 - Engine: Crankshaft for GM Image
    Crankshaft
    12708884
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $1,439.25 CAD
    $930.68 CAD
    MSRP $1,439.25 CAD
    $930.68 CAD
    31
    12665076 - Engine: Rear Main Seal for GM Image
    Rear Main Seal
    12665076
    GM GM
    MSRP $55.27 CAD
    $39.01 CAD
    MSRP $55.27 CAD
    $39.01 CAD
    32
    12705664 - Engine: Rear Main Seal Retainer for GM Image
    Rear Main Seal Retainer
    12705664
    GM GM
    Description: Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Express 2500. Express 3500. Savana 2500. Savana 3500.
    MSRP $146.38 CAD
    $98.97 CAD
    MSRP $146.38 CAD
    $98.97 CAD
    33
    12627520 - Engine: Rear Main Seal Gasket for GM Image
    Engine Crankshaft Sealing Flange Gasket
    12627520
    GM GM
    MSRP $10.72 CAD
    $7.88 CAD
    MSRP $10.72 CAD
    $7.88 CAD
    34
    12680364 - Engine: Vibration Damper for GM Image
    Vibration Damper
    12680364
    GM GM
    MSRP $178.42 CAD
    $118.57 CAD
    MSRP $178.42 CAD
    $118.57 CAD
    35
    12739177 - Engine: Oil Pan for GM Image
    Oil Pan
    12739177
    GM GM
    Notes: Includes: Oil Pick-up Tube, Oil Level Sensor, Pan Gasket, Deflector, And Oil Filter.
    Description: 6.6L gas. Savana 2500. Express 2500. Tahoe. Suburban. Incl.Drain Plug,Drain Plug Gasket and Engine Oil Pump Pickup Tube. 6.2L. Express 3500. Savana 3500.
    MSRP $442.64 CAD
    $294.05 CAD
    MSRP $442.64 CAD
    $294.05 CAD
    36
    12666993 - Engine: Oil Pan Gasket for GM Image
    Engine Oil Pan Gasket
    12666993
    GM GM
    MSRP $6.44 CAD
    $4.71 CAD
    MSRP $6.44 CAD
    $4.71 CAD
    37
    12744612 - Engine: Oil Pump for GM Image
    Pump
    12744612
    GM GM
    Description: Savana 2500. Suburban. Express 2500. Camaro. Tahoe. Express 3500. Savana 3500.
    MSRP $280.83 CAD
    $186.56 CAD
    MSRP $280.83 CAD
    $186.56 CAD
    1 This price excludes a refundable manufacturer's core charge. Add the part to your cart to see the core charge.