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  3. MANLEY 11663C

MANLEY 11663C Severe Exhaust Valves 1.550 5/16 4.745

fits model: 550.

11663c Manley Severe Duty Exhaust Valves 1.550 Inch 5/16 4.745 Long

( Brand: Manley ), ( Manufacturer Part Number: 11663C ), ( Type: Exhaust Valve ), ( Material: Stainless Steel ), ( Features: Swirel Polished ), ( Vintage Part: No ), ( Country Of Origin: United States ), ( Performance Part: Yes )

Review MANLEY Severe Duty Exhaust Valves 1.550 Inch 5/16 4.745 Long fits 550

Introducing the Manley 11663C Severe Duty Exhaust Valves, specifically designed for high-performance applications where durability and reliability are paramount. These valves are engineered to meet the demands of racing and high-horsepower street engines.

The Manley 11663C valves feature a 1.550-inch diameter intake valve and a 1.550-inch diameter exhaust valve, both with a 5/16-inch stem diameter. The exhaust valve has a unique 4.745-inch length to ensure optimal exhaust flow and scavenging in high-performance engines.

The valves are made from high-quality, forged steel bodies, ensuring maximum strength and durability. The valve seats are machined from Manley's proprietary, heat-treated, and chrome-molybdenum steel alloy, providing exceptional sealing characteristics and long-lasting performance even under extreme conditions.

The Manley 11663C valves also feature a unique stem design with a large, rounded radius at the base of the stem, providing excellent clearance for piston domes and reducing the risk of valve damage from piston contact. The stems are also fully machined for a perfect fit in the valve guide, ensuring proper sealing and minimizing the risk of leakage.

These valves are designed to work in high-RPM, high-horsepower applications, and are suitable for use in engines with forced induction or high-performance camshafts. The valves are available in a variety of materials, including titanium and stainless steel, to suit different engine requirements.

In summary, the Manley 11663C Severe Duty Exhaust Valves are a high-performance solution for demanding applications, offering superior durability, reliability, and performance. With their large diameter and unique stem design, these valves provide optimal exhaust flow and scavenging, making them an excellent choice for high-horsepower engines in racing or street applications.

Manley 11663C Severe Duty Exhaust Valves are designed to provide improved performance and durability in high-performance applications. Here are some pros and cons to help you make an informed decision about purchasing these valves:

Pros:

1. Enhanced Durability: Manley Severe Duty Exhaust Valves are made from high-strength materials, including hardened stainless steel stems and titanium valve heads. This makes them more resilient to the extreme heat and pressure encountered in high-performance applications.

2. Increased Performance: These valves are designed to provide improved flow and reduced restriction, which can result in increased power and torque. This makes them a popular choice among race car builders and high-performance enthusiasts.

3. Precision Engineering: Manley is known for its precision engineering, and these valves are no exception. They are designed to provide perfect sealing and minimal valve train noise, which can lead to improved engine performance and a more enjoyable driving experience.

Cons:

1. Higher Cost: Manley Severe Duty Exhaust Valves are more expensive than stock OEM valves. This may be a deterrent for some enthusiasts who are working on a budget.

2. Installation Complexity: Installing these valves can be a more complex process than installing stock OEM valves. This may require additional time, tools, and expertise.

3. Potential for Increased Noise: Some users have reported that these valves can result in increased exhaust noise. This may be a concern for those who value a quieter driving experience.

Conclusion:

Manley 11663C Severe Duty Exhaust Valves offer several benefits for high-performance applications, including increased durability, improved performance, and precision engineering. However, they come with a higher cost, installation complexity, and the potential for increased noise. Ultimately, the decision to purchase these valves depends on your priorities and budget. If you are building a high-performance engine and are willing to invest in top-quality components, then these valves may be a worthwhile investment. However, if you are working on a budget or value a quieter driving experience, then you may want to consider other options.

Recommendation:

If you are building a high-performance engine and are looking for top-quality exhaust valves, then the Manley 11663C Severe Duty Exhaust Valves are a solid choice. However, be prepared for the higher cost and potential installation complexity. If you are working on a budget or value a quieter driving experience, then you may want to consider alternative options from other manufacturers. Ultimately, it's important to carefully consider your priorities and budget before making a purchase.

Details:

1.550 DOA, 4.475 Long x .312.5 Stem, Swirl Polished. Valves, Manley 11633C Exhaust 12Pcs.

part #: 11663c price

  • $349.99

specifications voomvalve:

  • for models: 550
  • brand: Manley
  • mpn: 11663c
  • type: Exhaust Valve
  • material: Stainless Steel
  • features: Swirel Polished
  • vintage part: No
  • country of origin: United States
  • performance part: Yes

general voomvalve:

  • Engines Engine Parts > Valvetrain Components > Valves
  • condition: New other see details

shipping voomvalve:

  • service: USPS Priority Mail
  • type: Fixed
  • cost: $15.00
  • transit: 3-9 Days
  • carrier: USPS
  • class: Expedited

payments voomvalve:

  • credit card: Visa
  • other
  • wallet: Google-pay

returns voomvalve:

  • policy: Returns Accepted
  • paid by: Seller
  • time: 30 Days

seller voomvalve:

  • # reviews: 16105
  • rating: 99.8%
  • city: East Jordan, Michigan

offer voomvalve:

  • started: April 8, 2026
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
for models: 550, type: exhaust valve, features: swirel polished, vintage part: no, country of origin: united states, performance part: yes,
category: auto parts > engines engine parts > valvetrain components > valves, material: stainless steel, sku: 13110658134268983,

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1 offer $349.99 USD
  • Offer #1: $349.99 price + $15.00 shipping estimate = $364.99* total. 312.5 Stem, Swirl Polished. Manley 11633C Exhaust Valves, 12Pcs.+$15.00 shipping

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