What makes these valves 'Extreme Duty'?

The 'Extreme Duty' designation comes from the use of XH-432 XtremeAlloy material, which is chosen for its exceptional ability to withstand high temperatures and extreme forces found in demanding engine applications. They also feature chrome stems and hard tips for added durability.

What is the benefit of the swirl polished under head areas?

The swirl polished under head areas, along with the fully machined combustion faces, are designed to improve the flow of the air-fuel mixture into the cylinder. This optimization can contribute to better engine performance and combustion efficiency.

Are any other parts needed when installing these valves?

When rebuilding an engine top end with new valves, it's generally recommended to also replace valve springs, retainers, and seals to ensure optimal performance and longevity. Always refer to the manufacturer's installation instructions for a complete list of recommended components and procedures.

Specifications

Brand: Manley Performance
Part #: 11193-12
UPC: 807298074269

Manley Nissan GT-R 3.8L (VR38DETT) DOHC 32.15mm Extreme Duty Exhaust Valves (Set of 24)

Name: Manley Nissan GT-R 3.8L (VR38DETT) DOHC 32.15mm Extreme Duty Exhaust Valves (Set of 24)
Brand: Manley Performance
SKU: manley-performance-manley-nissan-gt-r-3-8l-vr38dett-dohc-32-15mm-extreme-duty-ex-t14-250573
Price: 894.89 USD
Availability: BackOrder

$894.89

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Fits 2009-2014 Nissan GT-R. Manley Extreme Duty exhaust valves made with XH-432 XtremeAlloy for superior heat and force resistance.

Key Features

Fits 2009-2014 Nissan GT-R.
Constructed from XH-432 XtremeAlloy for extreme heat and force resistance.
Features chrome stems and hard tips for improved longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces enhance airflow and combustion efficiency.
Set includes 24 exhaust valves, suitable for the Nissan GT-R's VR38DETT engine.

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About this part

Product Details

Starting with XH-432 XtremeAlloy, Manley's Extreme Duty exhaust valves are built for the toughest conditions your 2009-2014 Nissan GT-R's engine might face. These aren't your average valves; they're designed to handle extreme force and heat, making them a solid choice for high-performance builds where reliability under pressure is key.

The XH-432 XtremeAlloy material itself is a standout feature, offering exceptional resistance to the intense temperatures and stresses found in demanding engine applications. Beyond the material, these valves have chrome stems and hard tips, which add to their longevity and help them resist wear over time. You'll also notice the swirl polished under-head areas and fully machined combustion faces. This design work isn't just for looks; it helps improve airflow into the combustion chamber, contributing to better efficiency and performance.

This set includes 24 valves, covering all the exhaust ports for your GT-R's VR38DETT engine. If you're rebuilding the top end of your GT-R and need components that can stand up to serious heat and stress, these Manley valves are a well-built option.