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GM 12556320
Valve Springs

2001-2007 GM

Customer Questions & Expert Answers (10)
GM 12556320 Valve Springs
  • Part Description
    Spring, Engine Valve; Valve Spring
  • Manufacturer
    General Motors
Make sure this part fits
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  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers

  • 12556320 Valve Springs is Ref No. 8 in the diagram below

    2005 GMC Sierra 2500 HD Valve Springs Diagram for 12556320
    The diagram listed above is for your reference. View diagram for your vehicle

    Related Parts for 12556320

  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12556320
    Part DescriptionSpring, Engine Valve; Valve Spring
    Item Dimensions2.3 x 1.5 x 1.4 inches
    Item Weight0.50 Pounds
    ConditionNew
    ManufacturerGeneral Motors
    SKU12556320
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65

  • Vehicle Fitment

    Year Make Model Trim Engine
    2002-2006 Chevrolet Avalanche 2500Base, LS, LT8 Cyl 8.1 L GAS
    2001-2002 Chevrolet Express 3500Base, LS8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Silverado 2500 HDBase, LS, LT, WT8 Cyl 8.1 L GAS
    2007 Chevrolet Silverado 2500 HD ClassicLS, LT, WT8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Silverado 3500Base, LS, LT, WT8 Cyl 8.1 L GAS
    2007 Chevrolet Silverado 3500 ClassicLS, LT, WT8 Cyl 8.1 L GAS
    2001-2006 Chevrolet Suburban 2500Base, LS, LT8 Cyl 8.1 L GAS
    2001-2002 GMC Savana 3500Base, SLT8 Cyl 8.1 L GAS
    2001-2006 GMC Sierra 2500 HDBase, SL, SLE, SLT, WT8 Cyl 8.1 L GAS
    2007 GMC Sierra 2500 HD ClassicSL, SLE, SLT, WT8 Cyl 8.1 L GAS
    View More

  • Customer Questions & Expert Answers

    Q:
    Is this 12556320 designed for my car? Posted by ChevyPartsGiant Specialist
    A:
    Please Select Your Vehicle model to see if part number 12556320 is suitable before ordering.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to replace the Rocker Shaft Spring Kit and valve stem oil seal on Chevrolet Avalanche 2500? Posted by Customer
    A:
    You should start by removing the valve rocker arms and pushrods while making sure the serviced cylinder Piston rests at its lowest point because air pressure during maintenance could turn the engine. Turn the Crankshaft separately with both valves closed before taking out the Spark Plug from inside the cylinder. Insert the Spark Plug port adapter (J 22794) into the Spark Plug hole and block the valves with compressed air pressure. After tapping the valve spring cap gently use the valve spring compressor (J 5892-D) to secure the device to the cylinder head through the valve Rocker Arm nut. Press the valve spring compressor j5892-d unit onto the cylinder and remove valve stem keys without letting cylinder air escape. Open the cylinder head to extract the valve spring compressor (J 5892-D) and then remove the valve spring cap valve spring in that order before taking out the Valve Stem Oil Seal. Apply clean engine oil to the valve stem before putting it in place and apply oil on both sides of the valve guide seal. Additionally, lubricate the rotating components. Put the Valve Stem Oil Seal onto the valve tip and valve guide through the valve stem seal installer tool until it fits fully. Position the valve spring small end side up and put valve spring and valve spring cap into place. Insert the valve spring compressor model j 5892-d into the valve spring and push it down. Add a small piece of clean grease on each valve stem key to hold them before releasing the compressor. Apply air pressure on the valve spring compressor (J 5892-D) tool and then carefully remove it from the valve set. After removing the compressed air from the cylinder you can continue. Put back the valve rocker arms and pushrods after setting the Spark Plug in place.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to replace the Rocker Shaft Spring Kit and valve stem oil seal on Chevrolet Suburban 2500? Posted by Customer
    A:
    You should start by removing the valve rocker arms and pushrods while making sure the serviced cylinder Piston rests at its lowest point because air pressure during maintenance could turn the engine. Turn the Crankshaft separately with both valves closed before taking out the Spark Plug from inside the cylinder. Insert the Spark Plug port adapter (J 22794) into the Spark Plug hole and block the valves with compressed air pressure. After tapping the valve spring cap gently use the valve spring compressor (J 5892-D) to secure the device to the cylinder head through the valve Rocker Arm nut. Press the valve spring compressor j5892-d unit onto the cylinder and remove valve stem keys without letting cylinder air escape. Open the cylinder head to extract the valve spring compressor (J 5892-D) and then remove the valve spring cap valve spring in that order before taking out the Valve Stem Oil Seal. Apply clean engine oil to the valve stem before putting it in place and apply oil on both sides of the valve guide seal. Additionally, lubricate the rotating components. Put the Valve Stem Oil Seal onto the valve tip and valve guide through the valve stem seal installer tool until it fits fully. Position the valve spring small end side up and put valve spring and valve spring cap into place. Insert the valve spring compressor model j 5892-d into the valve spring and push it down. Add a small piece of clean grease on each valve stem key to hold them before releasing the compressor. Apply air pressure on the valve spring compressor (J 5892-D) tool and then carefully remove it from the valve set. After removing the compressed air from the cylinder you can continue. Put back the valve rocker arms and pushrods after setting the Spark Plug in place.
    Posted by ChevyPartsGiant Specialist
    Q:
    What tool is used to install the valve stem oil seal for the 2006 Chevrolet Avalanche 2500? Posted by Customer
    A:
    The Valve Stem Seal Installer (J 43105) is used to install the valve stem oil seal over the valve tip and onto the valve guide.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    What is the first step to replace the valve stem oil seal and valve spring for the 2004 Chevrolet Silverado 3500? Posted by Customer
    A:
    Remove the valve rocker arm and disconnect the spark plug wire at the spark plug by twisting each plug wire boot 1/2 turn and pulling only on the boot.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    How do you reinstall the spark plug for the 2007 Chevrolet Silverado 3500 Classic? Posted by Customer
    A:
    Remove the Spark Plug Port Adapter (J 22794) from the spark plug port, hand start the spark plug, and tighten it to 15 Nm (11 ft. lbs.).
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    What is the first step to replace the valve stem oil seal and valve spring for the 2006 Chevrolet Silverado 3500? Posted by Customer
    A:
    Remove the rocker arm and disconnect the spark plug wire at the spark plug by twisting each plug wire boot 1/2 turn and pulling only on the boot.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    What should be done after compressing the valve spring during installation for the 2002 GMC Savana 3500? Posted by Customer
    A:
    Install the valve stem keys and use grease to hold them in place.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    How do you compress the valve spring for the 2007 GMC Sierra 3500 Classic? Posted by Customer
    A:
    Use the J 38606 Valve Spring Compressor to compress the valve spring, then remove the valve stem keys and carefully release the valve spring tension before removing the J 38606.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    Q:
    How should the valve spring be installed for the 2006 GMC Sierra 3500? Posted by Customer
    A:
    With the small end facing up, followed by the valve spring cap.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Rocker Shaft Spring Kit
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

OEM GM 12556320, Excellent Performance and Perfect Fitment

To ensure reliability, purchase GM part # 12556320 Valve Springs. It is sometimes referred to as GM Rocker Shaft Spring Kit. Choosing OEM parts is the optimal decision for guaranteeing superior quality and perfect performance. These components undergo stringent quality checks and are carefully constructed to comply with GM's factory specifications, ensuring a smooth installation process.

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