Product Description
The GM 12637788 Grade C Right-Side (1.05mm) Cylinder Head Gasket is the correct OEM-thickness gasket for sealing the passenger-side cylinder head on 2001–2016 GM 6.6L Duramax engines. Built to OEM standards for fit and clamp-load control, this gasket is ideal for stock refreshes and performance repairs where proper thickness and long-term sealing matter most.
Fitment
- Engine: GM 6.6L Duramax Diesel
- Years: 2001–2016
- Engine Codes: LB7 / LLY / LBZ / LMM / LML
- Side / Position: Right Side (Passenger Side)
- Thickness / Grade: Grade C — 1.05mm
Highlights
- OEM GM replacement head gasket for correct sealing and fit
- Right-side / passenger-side application
- Grade C thickness: 1.05mm
- Designed for 2001–2016 Duramax 6.6L platforms
Specifications for GM 12637788
| Specifications for GM 12637788 | |
|---|---|
| UPC | 0808709358855 |
| GTIN | 0808709358855 |
| Shipping Info | Shipping Weight: 1.00 lb Package Dimensions: 23 in (L) x 9 in (W) x 1 in (H) |
| Prop 65 | WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov |
FAQ
Is GM 12637788 the right-side (passenger) head gasket?Yes — GM 12637788 is listed as the Right Side head gasket for the 6.6L Duramax applications.
This is a Grade C gasket with a 1.05mm thickness.
Fits 2001–2016 GM 6.6L Duramax platforms including LB7, LLY, LBZ, LMM, and LML.
Some listings note this gasket supersedes older GM numbers (commonly referenced as 98045057).
