-24%
Click to zoom in
SKU: 12347-8 | UPC: 807298086019
Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8) - Fits 2014-2019 Corvette, 2016-2023 Camaro
Manley Pro Flo Severe Duty Exhaust Valves deliver reliable power for Chevy LT1 6.2L engines in 2014-2019 Corvette Stingray and 2016-2023 Camaro SS models. Crafted from heat-resistant XH-428 Inconel these 1.590 inch head diameter valves handle extreme racing conditions with fatigue resistance. This set of 8 provides direct replacement for stock exhaust valves boosting engine breathing.
Key Features
- XH-428 Inconel Material: Resists high exhaust temperatures and maintains strength under prolonged high-rpm use
- 1.590in Head Diameter: Exact OEM match ensures drop-in fit and maintains stock valve shrouding for optimal combustion
- 11/32in Stem Diameter: Precision ground at 0.343in for tight guide clearance and reduced wear
- 4.875in Overall Length: Matches factory specs for correct valve timing lift and installed height
- Swirl Polished Finish: Enhances exhaust flow reduces valve bounce and supports higher rev limits
Product Notes
- Verify cylinder head valve seats before installation for compatibility
- Pair with upgraded valve springs rated for LT1 performance levels
- Handle valves carefully to avoid nicks on stems or seats
Installation Notes
- Professional installation recommended.
- Requires three-angle valve job for best sealing and flow
- Direct fit no machining needed compatible with stock LT1 heads
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2014-2019 | Chevrolet | Corvette | Stingray |
| 2016-2023 | Chevrolet | Camaro | SS |
Why Choose Manley?
- Decades of experience supplying valves to professional race teams
- Advanced alloys like XH-428 proven in NHRA and drag racing
- CNC machined in USA for exact tolerances and consistent quality
Frequently Asked Questions
-
Q: Will these fit my 2016 Camaro SS LT1?
A: Yes fits all 2016-2023 Chevrolet Camaro SS with 6.2L LT1 V8 engine VIN U. -
Q: What makes the XH-428 material suitable for exhaust valves?
A: XH-428 Inconel alloy offers superior heat corrosion resistance and tensile strength for severe duty exhaust applications. -
Q: What is the Manley warranty on these valves?
A: Lifetime warranty against manufacturing defects when installed by certified engine builder.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure Manley box with foam inserts
- Weight: 2 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