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SKU: 11661-8 | UPC: 807298051451
Manley Chevy LS-3/L-99 Small Block Severe Duty Exhaust Valves (Set of 8) 2008-2015 Corvette Camaro CTS-V
Manley Severe Duty Exhaust Valves deliver reliable power in high-performance Chevy LS3 and L99 small block engines. This set of 8 fits rectangular port cylinder heads on 2008-2015 Corvette Camaro SS CTS-V and similar GM vehicles. XH-428 material construction handles racing heat and stress for consistent exhaust flow.
Key Features
- XH-428 Material: Heat-resistant stainless alloy maintains strength at exhaust gas temperatures over 1600°F
- Valve Dimensions: 1.600 inch head diameter 5.000 inch overall length 8mm stem diameter for precise LS3/L99 fit
- Swirl Polished Heads: Improves airflow reduces valve weight enhances high-RPM efficiency
- Chrome-Faced Tip: Increases wear resistance extends valve life in aggressive valvetrain setups
- 3-Angle Seat Cut: 0.313 inch width ensures tight seal supports high compression builds
Product Notes
- Set includes 8 exhaust valves for complete cylinder head refresh
- Match with beehive or dual valve springs rated for 8000+ RPM
- Handle with care valves arrive in protective plastic sleeves
Installation Notes
- Professional installation recommended.
- Verify installed height and spring pressures during assembly
- Works with OEM or aftermarket titanium retainers and 10-degree locks
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2013 | Chevrolet | Corvette | Base/Grand Sport LS3 |
| 2010-2015 | Chevrolet | Camaro | SS LS3/L99 |
| 2012-2015 | Chevrolet | Camaro | ZL1 LSA |
| 2009-2015 | Cadillac | CTS-V | LSA |
| 2014-2017 | Chevrolet | SS | LT1 |
Why Choose Manley?
- Decades of experience supplying valves to professional racing teams
- Forged one-piece design withstands 10000+ RPM operation
- CNC machined tolerances hold under extreme cylinder pressures
Frequently Asked Questions
-
Q: Do these fit LS2 cathedral port heads?
A: No these are sized for LS3/L99 rectangular port heads LS2 requires different valve dimensions -
Q: What makes XH-428 material suitable for exhaust valves?
A: XH-428 offers high nickel content for corrosion resistance and thermal stability in hot exhaust environments -
Q: Is machining or special valvetrain parts needed?
A: Drop-in replacement for stock LS3/L99 seats guides use stock-length pushrods with proper spring combo
Shipping & Handling
- Method: UPS Ground
- Availability: Special order ships within 3-5 business days
- Packaging: Secure foam-lined cardboard box 6.2 x 5.4 x 1.3 inches
- Weight: 1.05 lbs
Manley Performance
Founded in 1966 by Hank Manley, Manley Performance Products has become one of the most respected names in high-performance engine components. Originally launched as Manley Speed Equipment, the company quickly earned a reputation for precision manufacturing, durability, and race-proven performance. From grassroots beginnings in New Jersey to global recognition in professional motorsports, Manley Performance continues to set the standard in high-performance automotive parts. Manley Performance Engine Parts Manley is known for manufacturing premium internal engine components designed for street, strip, and professional racing applications. Their product line includes: Manley stainless steel valves Manley forged pistons Manley connecting rods (H-Beam, I-Beam, Turbo Tuff, Pro Series) Manley camshafts Manley crankshafts Manley valvetrain components Valve springs, retainers, and hardware Every Manley component is engineered with strict quality control and race-driven innov...
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