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GM 12631813 Exhaust Manifold

2014-2020 GM

Customer Questions & Expert Answers (4)
12631813 GM Exhaust Manifold Product Photo 1 of 1
  • Part Description
    Manifold, Exhaust
  • Manufacturer
    General Motors
Make sure this part fits
$140.72 MSRP: $220.82
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Currently Unavailable

Due to manufacturer supply shortage, this item isn't currently available for ordering.

  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GM
    Manufacturer Part Number12631813
    Part DescriptionManifold, Exhaust
    Item Dimensions18.0 x 10.6 x 10.0 inches
    Item Weight11.10 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12631813
    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
    2018-2020 Chevrolet Express6 Cyl 4.3L1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS
    2014-2018 Chevrolet Silverado6 Cyl 4.3L1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 1500 DOUBLE CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, CREW CAB 1/2 TON
    2018-2020 GMC Savana6 Cyl 4.3L1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER SAVANA
    2014-2018 GMC Sierra6 Cyl 4.3L1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 1500 DOUBLE CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, CREW CAB 1/2 TON
  • 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 12631813 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What steps are needed for the left side Exhaust Manifold for the 2018 Chevrolet Express? Posted by Waymond M.
    A:
    For the left side manifold, remove the EGR pipe from the exhaust manifold and the inner splash shield from the fenderwell, again noting that access is easier with the front tire and inner fenderwell removed. 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 Jeremy / Jan 01, 2025
    Q:
    Are there any additional steps for easier access to the Exhaust Manifold on the 2018 Chevrolet Express? Posted by Edra B.
    A:
    Yes, on some models, it may be easier to remove the wheel and fender splash shield. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Jan 06, 2025
    Q:
    does the manifold comes with gaskets? Posted by Antonio A. / 2018 Light Truck Silverado / Sierra / Cheyenne - 03, 43, 53 Bodystyle (2WD)
    A:
    NO IT DOES NOT.......
    Answered by GM Parts Specialist Henry / Oct 21, 2025

Genuine GM Part 12631813, the Right Choice

To ensure reliability, purchase GM part # 12631813 Exhaust Manifold. It is sometimes referred to as GM 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 Chevrolet Express, Silverado models. It fits GMC Savana, Sierra.

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