Make sure this part fits

GMC 12511890 Seal Kit,Valve Stem Oil

1985-1996 GMC

Customer Questions & Expert Answers (3)
12511890 GM Seal Kit,Valve Stem Oil Product Photo 1 of 7
  • Part Description
    SEAL KIT, Engine Valve
  • Replaces
    14033546, 10132715
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number12511890
    Part DescriptionSEAL KIT, Engine Valve
    Other NamesValve Seal, Valve Seal Kit
    Item Dimensions5.8 x 2.3 x 1.3 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces14033546, 10132715
    ManufacturerGeneral Motors
    SKU12511890
    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
    1990-1995, 1985-1986 GMC C15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LC1500 EXTENDED CAB LONG BOX, C1500 EXTENDED CAB STANDARD BOX, C1500 REGULAR CAB LONG BOX, C1500 REGULAR CAB STANDARD BOX, REGULAR CAB LONG BOX, REGULAR CAB STANDARD BOX
    1990-1995, 1985-1986 GMC C25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LC2500 EXTENDED CAB LONG BOX, C2500 EXTENDED CAB STANDARD BOX, C2500 REGULAR CAB, CREW CAB, REGULAR CAB
    1990-1995, 1985-1986 GMC C35008 Cyl 5.7LC3500 CAB CHASSIS 135.5, C3500 CAB CHASSIS 159.9, C3500 CAB CHASSIS 183.5, C3500 CREW CAB LONG WHEELBASE, C3500 EXTENDED CAB, C3500 REGULAR CAB, CAB CHASSIS 135.5, CAB CHASSIS 159.9, CREW CAB, REGULAR CAB
    1992-1995 GMC G15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L1/2 TON CARGO, 1/2 TON PASSENGER
    1992-1995 GMC G25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L3/4 TON CARGO, 3/4 TON PASSENGER
    1992-1996 GMC G35006 Cyl 4.3L, 8 Cyl 5.7L1 TON CARGO, 1 TON CARGO CLASSIC, 1 TON CARGO VAN, 1 TON COMMERCIAL/RECREATIONAL VEHICLE, 1 TON COMMERCIAL/RV CLASSIC, 1 TON PASSENGER, 1 TON PASSENGER CLASSIC
    1992-1995, 1985-1988 GMC Jimmy6 Cyl 4.3L1/2 TON, 2 DOOR, 4 DOOR
    1990-1995, 1985-1986 GMC K15006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LK1500 EXTENDED CAB LONG BOX, K1500 EXTENDED CAB STANDARD BOX, K1500 REGULAR CAB LONG BOX, K1500 REGULAR CAB STANDARD BOX, REGULAR CAB LONG BOX, REGULAR CAB STANDARD BOX
    1990-1995, 1985-1986 GMC K25006 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7LK2500 EXTENDED CAB LONG BOX, K2500 EXTENDED CAB STANDARD BOX, K2500 REGULAR CAB, REGULAR CAB
    1990-1995, 1985-1986 GMC K35008 Cyl 5.7LCAB CHASSIS 135.5, CAB CHASSIS 159.9, CREW CAB, K3500 CAB CHASSIS 135.5, K3500 CAB CHASSIS 159.9, K3500 CREW CAB LONG WHEELBASE, K3500 EXTENDED CAB, K3500 REGULAR CAB, REGULAR CAB
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  • 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 12511890 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    What can be used if compressed air is not available for the 1990 Chevrolet Astro, particularly regarding the Valve Stem Oil Seal? Posted by Ford C.
    A:
    A length of nylon rope can be used to prevent the valves from falling into the cylinder if compressed air isn't available. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Raul / Mar 15, 2024
    Q:
    What tools and equipment do you need to replace broken valve springs or defective Valve Stem Oil Seals without removing the cylinder head for the 1994 Chevrolet S10? Posted by Tori R.
    A:
    You will need specific tools and a compressed air source. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Nicholas / Jan 28, 2026

Genuine GM Part 12511890, the Right Choice

To ensure reliability, purchase GM part # 12511890 Seal Kit,Valve Stem Oil. It is sometimes referred to as GMC Valve Stem Oil Seal. 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 GMC C2500, Suburban, Yukon models.

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