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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
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