-9%
Click to zoom in
SKU: C15745-063 / UPC: 191070590604
Cometic .063" MLS Cylinder Head Gasket for GM LSX / Gen-4 Small Block V8 (4.200" Bore, LHS)
The Cometic is a premium Multi-Layer Steel (MLS) cylinder head gasket designed for high-performance GM LSX and Gen-4 Small Block V8 engines. With a .063" compressed thickness and a 4.200" bore, this gasket is ideal for stroker builds, boosted applications, and high-horsepower LS engines. It features Cometic’s advanced DST coating for superior sealing, excellent heat resistance, and long-term durability under extreme conditions.
Key Features
- Multi-Layer Steel (MLS) Construction – Provides excellent sealing strength and durability
- DST Coating – Cometic’s proprietary coating improves sealing and resists heat and chemicals
- 4.200" Bore – Popular size for 427ci and larger LS stroker combinations
- .063" Compressed Thickness – Ideal for performance and boosted applications
- 1/2" & 3/8" Stud Compatible – Designed to work with mixed stud sizes
- Left Hand Side (LHS) – Driver’s side gasket
Specifications
| Detail | Value |
|---|---|
| Brand | Cometic Gasket |
| Type | MLS Cylinder Head Gasket |
| Bore Size | 4.200 inches |
| Compressed Thickness | .063 inches |
| Material | Multi-Layer Steel with DST Coating |
| Stud Compatibility | 1/2" & 3/8" Mixed |
| Position | Left Hand Side (Driver's Side) |
| Country of Origin | United States |
| Warranty | Cometic Limited Warranty |
Whats Included
- One Cometic MLS Cylinder Head Gasket (LHS)
Product Notes
- This is a single gasket (Left Hand Side only). Order two for a complete engine
- Recommended for high-performance, boosted, or stroker LS builds
- Proper surface preparation and torque procedures are critical for best results
This Part Fits
| Engine Family | Common Applications | Notes |
|---|---|---|
| GM LSX / Gen-4 Small Block V8 | LS3, LS7, L92, L99, LS9, and stroker combinations | 4.200" bore applications (2006+) |
| GM LSX Race Blocks | LSX 427, LSX 454, and other aftermarket LSX blocks | High-performance and boosted builds |
Why Choose Cometic?
- Industry leader in high-performance MLS head gaskets
- Used by top engine builders in drag racing, road racing, and boosted applications
- Advanced coatings and materials for superior sealing under extreme conditions
- Made in the USA with strict quality control
Frequently Asked Questions
- Q: Is this gasket for the driver or passenger side?
- A: This is the Left Hand Side (LHS / Driver’s side) gasket only.
- Q: What bore size is this gasket designed for?
- A: It is designed for a 4.200" bore, commonly used in 427ci and larger LS stroker engines.
- Q: Can this be used on a stock LS3 or LS7?
- A: It can be used, but it is most popular in performance, stroker, and boosted applications.
- Q: Do I need to use sealant with this gasket?
- A: Cometic MLS gaskets are designed to be used dry on clean, flat surfaces. Always follow Cometic’s recommended installation procedures.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure Cometic retail packaging
Cometic Gasket
Cometic Gasket produces precision-machined engine sealing components used by professional engine builders and race teams worldwide. MLS head gaskets, intake gaskets, and complete engine gasket sets from Cometic are engineered to hold seal under the elevated cylinder pressure and heat cycling that OEM gaskets cannot always survive in high-performance applications.Popular UpgradesCometic MLS (multi-layer steel) head gaskets are the most-requested upgrade for turbocharged, supercharged, and naturally aspirated builds where cylinder pressure exceeds the limits of OEM composite gaskets. Available in bore sizes and thicknesses calibrated to manage compression ratio, Cometic MLS head gaskets are a standard specification for any serious engine build. Intake manifold gaskets, exhaust gaskets, and cam cover sets round out the range for complete engine assembly work.Why use Cometic MLS head gaskets over OEM?Cometic MLS head gaskets use multiple layers of embossed stainless steel that create a ...
View Cometic Gasket Products
Engine
Shop engine parts, oil catch cans, engine cooling upgrades, thermostats, thermostat housings, radiators, coolant accessories, supercharger pulleys, idler pulleys, tensioner pulleys, throttle bodies, engine covers, fuse box covers, cap covers, valve covers, oil system parts, ignition parts, sensors, gaskets, fuel delivery parts, and engine bay dress-up accessories at Black Ops Auto Works. This collection is built for performance vehicles, trucks, SUVs, muscle cars, boosted builds, HEMI platforms, Hellcat builds, Trackhawk SUVs, RAM TRX trucks, LS-powered builds, and high-horsepower street or track applications. Whether you are improving oil control, reducing heat soak, upgrading cooling, supporting higher boost, cleaning up the engine bay, replacing worn engine components, or preparing a street car for harder driving, this collection helps you shop engine parts by brand, category, vehicle platform, and performance goal. Shop Engine Parts by Category Browse engine upgrades and replace...
View Engine Products
Head Components
This collection covers cylinder head components including head gaskets, head studs, and complete head assemblies for performance engine builds and high-output applications, serving vehicle owners and builders who need reliable components for maintenance, restoration, or performance enhancement. Arp head studs, cometic head gaskets, and edelbrock or afr cylinder heads are foundational brands in performance cylinder head work, providing buyers with the confidence that comes from sourcing from recognized suppliers with documented fitment data. Proper head bolt torque sequence and head gasket compression thickness selection directly affect combustion sealing integrity and engine longevity, and selecting the correct specification for the specific application is the most important step before any installation. Whether the goal is restoring OEM function, addressing a worn component, or improving beyond factory performance, this collection addresses each need with confirmed-fit parts. Popul...
View Head Components Products
Head Gaskets
This collection covers cylinder head components including head gaskets, head studs, and complete head assemblies for performance engine builds and high-output applications, serving vehicle owners and builders who need reliable components for maintenance, restoration, or performance enhancement. Arp head studs, cometic head gaskets, and edelbrock or afr cylinder heads are foundational brands in performance cylinder head work, providing buyers with the confidence that comes from sourcing from recognized suppliers with documented fitment data. Proper head bolt torque sequence and head gasket compression thickness selection directly affect combustion sealing integrity and engine longevity, and selecting the correct specification for the specific application is the most important step before any installation. Whether the goal is restoring OEM function, addressing a worn component, or improving beyond factory performance, this collection addresses each need with confirmed-fit parts. Popul...
View Head Gaskets Products