MANLEY 12737-8 Extreme Exhaust Valves Big Block 099998703864 1.880

( Brand: Manley ), ( Manufacturer Part Number: 12737-8 ), ( Part Type: Valve Exhaust Block ), ( UPC: 099998703864 )

Review MANLEY Extreme Duty Exhaust Valves Big Block Chevy 1.880 Diameter fits 2018

Introducing the Manley 12737-8 Extreme Exhaust Valves, specifically designed for Big Block Chevy engines with a 1.880 inch (47.74mm) exhaust valve diameter. These valves are part of Manley's Extreme series, engineered to deliver superior performance and durability for high-performance applications.

Each valve is meticulously crafted from 356 aluminum alloy, providing excellent heat dissipation capabilities. The valve stems are made from chrome-molybdenum steel, ensuring strength and resistance to fatigue. The valve seats are precision-machined from Manley's exclusive, high-performance 273 material, which offers superior sealing characteristics and long-lasting performance.

The Manley 12737-8 Extreme Exhaust Valves feature a unique design with a full-length valve guide to ensure proper alignment and reduce the risk of valve float. The guide is made from beryllium copper, which provides excellent thermal conductivity and durability. The valves also come with titanium retainers, ensuring a precise fit and reliable retention of the valves.

These exhaust valves are designed to handle high-performance applications, with a recommended lift of 0.700 inches (17.78mm) and a maximum lift of 1.000 inches (25.4mm). The valves have a hardness of Rockwell C 55-58, ensuring they can withstand the extreme temperatures and pressures generated in high-performance engines.

In summary, the Manley 12737-8 Extreme Exhaust Valves are a high-performance solution for Big Block Chevy engines requiring superior sealing, durability, and resistance to heat. With their precision engineering, top-quality materials, and unique design features, these valves are the perfect choice for demanding performance applications.

Manley 12737-8 Extreme Exhaust Valves are aftermarket valves designed for big block Chevy engines with a 1.880-inch exhaust valve diameter. These valves are known for their durability and high performance capabilities. Here are some pros and cons to consider before making a purchase:

1. Enhanced Performance: Manley Extreme Exhaust Valves provide improved flow and reduced restriction compared to stock valves. This results in increased power and torque.

2. Durability: These valves are made from high-quality materials, including stainless steel and titanium, which make them more durable than stock valves. They can withstand high temperatures and pressures, making them suitable for high-performance applications.

3. Improved Throttle Response: The reduced restriction and improved flow provided by Manley Extreme Exhaust Valves result in quicker throttle response, allowing for better acceleration and smoother engine operation.

4. Customizability: Manley offers various options for these exhaust valves, including different valve springs and retainers, to cater to different engine configurations and performance goals.

1. Cost: Manley Extreme Exhaust Valves are more expensive than stock valves. This may be a significant investment for some enthusiasts, especially those on a budget.

2. Installation: Installing aftermarket exhaust valves can be a complex and time-consuming process. It may require specialized tools and knowledge to ensure proper installation and seating of the valves.

3. Potential Increase in Noise: Depending on the specific engine configuration and exhaust system, the use of Manley Extreme Exhaust Valves may result in an increase in exhaust noise. This may be desirable for some enthusiasts, but it may be a concern for others.

Manley Extreme Exhaust Valves offer significant performance benefits for big block Chevy engines, including improved flow, reduced restriction, enhanced durability, and quicker throttle response. However, they come with a higher cost, complex installation process, and potential increase in exhaust noise.

If you are an enthusiast looking to maximize the performance of your big block Chevy engine, Manley Extreme Exhaust Valves may be a worthy investment. Their durability and high-performance capabilities make them a popular choice among performance enthusiasts. However, it is essential to consider the additional cost and installation complexity before making a purchase. Prospective buyers should also carefully evaluate their engine configuration and exhaust system to determine whether the potential increase in exhaust noise is acceptable.

Details:

American Express.

part #: 127378 prices

• $125.96-$315.59

specifications voomvalve:

• for makes: Chevy
• for years: 2018
• brand: Manley
• mpn: 12737-8
• part type: Valve Exhaust Block
• upc: 099998703864

offer voomvalve:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: November 9, 2025
• quantity: 4

seller voomvalve:

• city: , Ohio
• # reviews: 605293
• rating: 98.7%

general voomvalve:

• Engines Engine Parts > Valvetrain Components > Valves
• condition: New

shipping voomvalve:

• type: Fixed
• transit: 11-17 Days
• cost: $0.00
• class: Standard
• service: Standard

returns voomvalve:

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

payments voomvalve:

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

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