SKU: 9241 | UPC: 677418004373
Gibson Replacement Header Gasket Chevrolet 4.8L 5.3L GM 5.3L 6.0L 1999-2007
Gibson replacement header gaskets deliver a precise seal for Chevrolet 4.8L and 5.3L Vortec engines plus GM 5.3L and 6.0L LS engines in trucks and SUVs like Silverado Sierra Tahoe and Yukon. These MLS gaskets pair perfectly with Gibson performance headers for improved exhaust flow. Expect reliable sealing that supports average 5-10 horsepower gains when installed with compatible headers and backed by Lifetime Limited Warranty.
Key Features
- MLS Multi-Layer Steel Construction: Forms a durable leak-proof barrier that handles extreme cylinder pressures and exhaust heat over 2000 degrees F
- Precise Port Matching: Square exhaust ports match Gibson headers and OEM manifolds on cathedral port LS engines for unrestricted flow
- Sold as Pair: Includes two gaskets for left and right headers with 040 inch thickness for stock or performance setups
- High-Temperature Resistant: Maintains integrity under boost or high RPM conditions without cracking or blowing out
- Bolt-On Direct Fit: No trimming or modifications required for hassle-free replacement on 1999-2007 GM LS applications
Product Notes
- Confirm engine code LR4 LM7 L59 LY5 LQ4 or LQ9 prior to purchase
- Clean cylinder head and header surfaces thoroughly for best results
- Standard ground shipping with tracking provided
Installation Notes
- Professional installation recommended.
- Torque header bolts to manufacturer specs in 3 stages using moly lube
- Compatible with OEM ARP or aftermarket header bolts and studs
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2006 | Chevrolet | Silverado 1500 | 4.8L V8 5.3L V8 |
| 1999-2006 | GMC | Sierra 1500 | 4.8L V8 5.3L V8 |
| 2000-2006 | Chevrolet | Tahoe | 5.3L V8 |
| 2000-2006 | GMC | Yukon | 5.3L V8 |
| 2002-2006 | Chevrolet | Avalanche 1500 | 5.3L V8 |
| 2003-2006 | Chevrolet | Silverado 1500 HD | 6.0L V8 |
| 2003-2006 | GMC | Sierra 1500 HD | 6.0L V8 |
| 2000-2006 | Chevrolet | Suburban 1500 | 5.3L V8 |
| 2000-2006 | GMC | Yukon XL 1500 | 5.3L V8 |
| 1999-2007 | Chevrolet | Express 2500 | 6.0L V8 |
Why Choose Gibson?
- Proven leader in performance exhaust components since 1969
- Engineered and tested for GM LS engines in real-world conditions
- Precision manufacturing ensures exact fit and long-term durability
Frequently Asked Questions
- Q: Will this gasket fit a 2004 Chevy Silverado 1500 with 5.3L LM7 engine?
A: Yes it fits 1999-2006 Silverado 1500 5.3L V8 models with cathedral port heads including LM7 L59 and Vortec variants - Q: What material are these header gaskets made from?
A: Multi-layer steel MLS with 040 inch thickness designed for high-pressure sealing on LS engines - Q: What warranty coverage does this product have?
A: Backed by Gibson Lifetime Limited Warranty against defects in materials and workmanship
Shipping & Handling
- Method: Standard Ground
- Availability: In stock – ships same or next business day
- Packaging: Protective box 12 x 9 x 1 inches
- Weight: 0.38 lbs
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