-24%
Click to zoom in
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
Manley Performance is a New Jersey-founded engine internals manufacturer stocked at Black Ops Auto Works, supplying forged pistons, connecting rods, valves, and crankshafts across domestic and import platforms. Shop Manley H-Beam and H-Tuff connecting rods, Race Master Series valves, forged crankshafts, and valve springs for Ford Modular and Coyote, Chrysler HEMI, Subaru EJ and FA, Nissan SR20 and 2JZ, Honda B and H-series, and Mitsubishi 4B11T and Mazda MZR platforms. Every product is filterable by year, make, model, and engine code so the correct part ships the first time. Black Ops Auto Works carries 270 Manley Performance SKUs across pistons, rotating assembly, and valvetrain components. About Manley Performance Founded in 1966 by Hank Manley as Manley Speed Equipment, Manley Performance has grown into one of the most established names in high-performance engine internals. From grassroots drag racing roots in New Jersey to a second manufacturing facility in Orange, Californi...
View Manley Performance Products
Valves
Engine valves for import, domestic, and European performance builds are stocked at Black Ops Auto Works. Shop intake valves, exhaust valves, single-groove and triple-groove valves, Inconel and titanium valves, and complete valve sets for 2JZ, RB26, RB25, VR38DETT, K-series, EA888, EA113, FA20, S58, B58, and HEMI 5.4L and 5.7L applications. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 577 valve SKUs across intake, exhaust, and material specification categories. What This Category Covers The Valves category covers replacement and upgraded intake and exhaust valves for naturally aspirated, turbocharged, and supercharged cylinder heads. Coverage spans budget-focused OE-spec valves through race-grade Inconel and titanium valves built for sustained high RPM and boosted horsepower. Categories Included Intake valves, exhaust valves, single valves sold individually, and full valve set...
View Valves Products
Valves & Components
Valves and valvetrain components for import, domestic, and performance engine platforms are stocked at Black Ops Auto Works. Shop intake valves, exhaust valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, and lash caps for Toyota 2JZ and Supra, Honda K-Series, Nissan RB and SR20, BMW B58 and S58, Subaru FA20, Ford Coyote, and GM LS platforms. Every part is filterable by year, make, model, and engine so builders and tuners can confirm fitment before ordering. Black Ops Auto Works carries 1,391 valvetrain SKUs from proven performance brands. What This Category Covers Valves and valvetrain components manage airflow into and out of the combustion chamber and keep the valvetrain sealed and stable at high RPM. This collection spans intake valves, exhaust valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, lash caps, and cam follower shims. Why the Valvetrain Matters for Pe...
View Valves & Components Products