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Manley Extreme Duty Triple Groove Exhaust Valves for Ford 4.6/5.4L DOHC 3V
When it comes to enhancing the performance of your Ford 4.6L and 5.4L DOHC 3V engines, the Manley Extreme Duty Triple Groove Exhaust Valves (part number 11631-8) are a game changer. With over 40 years of experience, Manley Performance has set the standard for stainless steel valves, and these exhaust valves are no exception. Crafted with precision and designed to deliver optimal flow, they are perfect for both street and race applications.
Key Features
- Exceptional Material: Made from Manley's exclusive "Race Series" alloy, these valves are built to withstand extreme conditions.
- Durable Design: Features chrome stems, swirl polished under heads, and fully hardened tips for unmatched durability.
- Precision Engineering: Each valve is meticulously machined for controlled margin heights and exact stem-to-seat concentricity.
- Extreme Duty Alloy: The "Extremealloy" material provides superior hot hardness and high-temperature strength, making it ideal for high-boost applications.
Benefits of Manley Extreme Duty Valves
These valves are engineered to outperform competitors, even in the most demanding environments. Whether you’re building a mild street performer or a high-powered race car exceeding 1000 horsepower, Manley valves are designed to meet your needs. The triple groove design ensures a secure fit and optimal sealing, which translates to improved performance and reliability.
Specifications
- Part Number: 11631-8
- Application: Ford 4.6L and 5.4L DOHC 3V Engines
- Material: Stainless Steel with Extremealloy
- Design: Triple Groove
Fitment Information
These exhaust valves are specifically designed to fit Ford 4.6L and 5.4L DOHC 3V engines. Before installation, it’s strongly recommended to check your valve guide size to ensure the proper valve stem to guide clearance. In some cases, honing the guides may be necessary when replacing stock factory valves.
Customer Insights
Many users have praised the Manley Extreme Duty valves for their performance and reliability. Customers report improved throttle response and a noticeable increase in power, especially in boosted applications. The quality of craftsmanship is frequently highlighted, with many stating that these valves have outlasted their expectations in both street and racing conditions.
Experience the difference that high-quality valves can make in your engine's performance. Upgrade to Manley Extreme Duty Triple Groove Exhaust Valves for your Ford 4.6L and 5.4L DOHC 3V and feel the power!
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
1995 Ford Explorer |
Explorer | 1995 |
|
2009 Ford F-150 |
F-150 | 2009 |
|
2005 Ford Mustang |
Mustang | 2005 |

Manley Performance, formerly called Manley Speed Equipment, was established in 1966 by Hank Manley shortly after his graduation from Brown University. His interest in the performance and racing traced back to 1960 when, at age 17, he rebuilt a 312 CID Ford V8 engine, installed a camshaft and three two-barrel carbs, and raced a ’56 Thunderbird on New Jersey’s streets. Initially, the company’s product lineup included stainless valves, lifters, camshafts, forged pistons, vanadium valve springs, pushrods, and timing chain kits. By 1998, Manley had outgrown its first Bloomfield, New Jersey facility and bought several acres in Lakewood, New Jersey. It was around this time that the brand’s name formally changed to Manley Performance. Nearly a decade later, the production space doubled in size.
Evolving in the Automotive SpaceLed by GM Michael Tokarchik in 2002, Manley entered the high-performance passenger car market as an OEM supplier of connecting rods for the 2003/2004 Ford SVT Mustang Cobra. Production reached 2500 rods per week without missing a single delivery date. Ford awarded Manley its highest ever supplier rating. Manley’s presence in the OEM market continued from there as a supplier for the Ford GT. After nearly 50 years since its inception, Manley continues to be globally recognized as the leading manufacturer of performance valves, connecting rods, cylinder head components, pushrods, drive and oil systems, and several other engine parts.
What is Manley’s Specialty?Manley Performance specializes in high-performance engine internals that range from stock replacements to full-on race applications. They have been the standard of the industry since their inception; a fact that still remains true now as they have ventured into new markets. Today, Manley Performance continues to re-define itself in a high-performance aftermarket industry that is constantly evolving. The brand has developed a wide range of new products for growing markets that include sport compact, Ford modular, and Chevy LS. Manley also maintains its leadership role with the traditional V8 engine business.
Get Manley Performance at Vivid RacingIf you are in need of a serious upgrade to your engine, then Manley Performance parts should be on your list. Like all of our suggested manufacturers, Manley uses the best materials available to ensure a quality part for your engine. We carry Manley connecting rods, crankshafts, pistons, and valve components. The large lineup of domestic parts includes sport compact vehicles, Ford modular engines, GM’s LS series internals, and HEMI product upgrades for Chrysler.
If you can’t find what you’re looking for or need help choosing the right part for your car, call our sales team at (480) 966-3040. We are here to make your buying experience a breeze.
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