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Cadillac 12556039 Engine Exhaust Manifold

1999-2000 Cadillac Escalade

Customer Questions & Expert Answers (3)
12556039 GM Engine Exhaust Manifold Illustration 1 of 1
  • Part Description
    Manifold, Exhaust ; Manifold, Engine Exhaust Manifold
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Cadillac
    Manufacturer Part Number12556039
    Part DescriptionManifold, Exhaust ; Manifold, Engine Exhaust Manifold
    Other NamesExhaust Manifold
    Item Dimensions20.7 x 8.8 x 4.1 inches
    Item Weight15.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12556039
    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 Engine Important vehicle option details
    1999-2000 Cadillac Escalade8 Cyl 5.7L1/2 TON, 4 DOOR 1/2 TON, CLASSIC 4 DOOR 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, YUKON/DENALI/ESCALADE
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12556039 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What is the installation process for the Exhaust Manifolds for the 2000 Chevrolet Express? Posted by Layne R.
    A:
    Install the heat shields, bolts, and gaskets onto the manifold, ensuring the retaining tabs hold the assembly together during installation. Place the manifold on the cylinder head and install the mounting bolts finger tight, then tighten the bolts from the center to the ends using a torque wrench, completing the process in two steps. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jose / Aug 16, 2023
    Q:
    What is the next step after removing the necessary components for the right side Exhaust Manifold for the 2001 Chevrolet Express? Posted by Moiz S.
    A:
    Bend the lock tabs back if equipped, then remove the mounting bolts and separate the exhaust manifold from the cylinder head, followed by removing the heat shields. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Henry / Oct 30, 2025

Genuine GM Part 12556039, the Right Choice

To ensure reliability, purchase GM part # 12556039 Engine Exhaust Manifold. It is sometimes referred to as Cadillac Exhaust Manifold. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac Escalade models.

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