GMC Sierra Engine Gaskets and Seals
Engine gaskets and seals are among the foundational components that keep a GMC Sierra's engine assembly properly contained, covering model years 2002 through 2025. The range here includes cylinder head gaskets, oil drain plug gaskets, manifold gaskets, and more — in OE replacement and performance-oriented options. Select your year above and we'll show only the engine gaskets and seals that fit your GMC Sierra. Fitment is checked against our vehicle data for every part listed.
Cometic C5475-056 MLS Cylinder Head Gasket GM Gen III/IV Bore - LS1/LS2/LS3/LS6 3.910
Cometic C5751-084 MLS Cylinder Head Gasket GM Gen III/IV Bore - LS1/LS2/LS3/LS6 4.060
Cometic PRO1050T GM LS3/L83/L86 Gen V Small Block V8 Top End Gasket Kit
Cometic C5489-062 MLS Cylinder Head Gasket GM Gen III/IV Bore - LS1/LS2/LS3/LS6 4.100
Cometic C5318-089 MLS Cylinder Head Gasket GM Gen III/IV Bore - LS1/LS2/LS3/LS6 4.160
Cometic C15426-052 GM Gen-V Small Block V8 Cylinder Head Gasket .052" MLX
Cometic C15517-040 MLS Cylinder Head Gasket GM Bore - LS1/LS2/LS3/LS6 4.200
Cometic C15514-051 MLS Cylinder Head Gasket GM Bore - LS1/LS2/LS3/LS6 4.070
Cometic C5319-075 MLS Cylinder Head Gasket GM Gen III/IV Bore - LS1/LS2/LS3/LS6 4.190
What's here for your GMC Sierra
- Engine cylinder head gaskets, available as individual gaskets and full kits
- Engine oil drain plug gaskets in rubber and OE-style materials
- Manifold gaskets for front and rear positions
- Performance and OE replacement gasket sets
The widest selection here comes from Cometic, ACDelco, Victor, and Dorman, spanning a broad range of gasket types, materials, and fitment styles for the GMC Sierra. Other categories GMC Sierra owners shop for: GMC Sierra Exterior Lights, GMC Sierra Valve Train Parts and GMC Sierra Springs and Suspension Parts, or browse all GMC Sierra parts and accessories.