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SKU: 12629-8 | UPC: 807298121093
Manley Race Master Series Exhaust Valve Set 1.260" 2011+ Ford Mustang Coyote 5.0L Gen III (8pcs)
The Manley 12629-8 Race Master Series Exhaust Valve Set delivers high exhaust flow and strength for 2011+ Ford Mustang Coyote 5.0L Gen III engines in GT Boss 302 Shelby GT350 GT500 and F-150 models. Machined from premium stainless steel with 1.260in head diameter these valves handle high RPM up to 8000+ in naturally aspirated supercharged or turbo setups. Swirl polished stems and hardened tips ensure reliability in race conditions.
Key Features
- 1.260" Head Diameter: Matches Coyote 5.0L Gen III ports for increased exhaust flow and horsepower gains
- Premium Stainless Steel: Resists high exhaust temperatures and maintains shape under extreme stress
- Swirl-Polished Stems: Minimizes friction and guides flow smoothly for better efficiency
- Fully Machined Combustion Face: Seals tightly and promotes even heat dissipation
- Hardened Tip Ends: Withstands aggressive valve train wear from high lift cams
Product Notes
- Sold as complete set of 8 for one cylinder head upgrade
- Pair with matching Manley intake valves springs and retainers
- Made in United States with limited manufacturer warranty
Installation Notes
- Professional installation recommended.
- Requires cylinder head removal valve job and seating
- Use with upgraded valve springs retainers and full valvetrain check
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2011-2014 | Ford | Mustang | GT 5.0L Coyote V8 |
| 2012-2013 | Ford | Mustang | Boss 302 5.0L Coyote V8 |
| 2015-2017 | Ford | Mustang | GT 5.0L Coyote V8 |
| 2018-2023 | Ford | Mustang | GT 5.0L Coyote Gen 3 V8 |
| 2016-2020 | Ford | Mustang | Shelby GT350 5.2L Voodoo (Coyote based) |
| 2020-2022 | Ford | Mustang | Shelby GT500 5.2L Predator (Coyote based) |
| 2011+ | Ford | F-150 | 5.0L Coyote V8 |
Why Choose Manley?
- Proven in motorsport with decades of engine building experience
- Precision CNC machining for exact fit and performance
- Engineered specifically for Ford Coyote engines in race applications
Frequently Asked Questions
-
Q: Does this fit 2018-2023 Mustang GT 5.0L Coyote Gen 3?
A: Yes 12629-8 fits all 2011+ Coyote 5.0L Gen 1-3 in Mustang GT Boss 302 Shelby and F-150. -
Q: What material are these exhaust valves?
A: Premium stainless steel with swirl polished stems hardened tips and machined faces for heat and wear resistance. -
Q: Is valve job or new springs needed?
A: Yes requires professional head work upgraded springs retainers and break-in procedure for high RPM use.
Shipping & Handling
- Method: UPS/FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure retail box 10x6x2 inches
- Weight: 2.1 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...
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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...
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