What material are these Manley valves made from?

These intake valves are constructed from a specific stainless steel alloy, NK-842. They also feature chrome stems and hard tips for added durability and wear resistance.

What is the advantage of the swirl polished and machined faces?

The swirl polished under head areas and fully machined combustion faces are designed to improve airflow into the cylinder. This can lead to more efficient combustion and potentially better engine performance.

Are these valves suitable for high-RPM engines?

Yes, Manley's Race Series valves are engineered for engines operating under 8000 RPM, making them a strong choice for demanding racing applications.

Specifications

Brand: Manley Performance
Part #: 11174-12

Manley Nissan Patrol 40mm Race Master Intake Valves (Set of 12)

Name: Manley Nissan Patrol 40mm Race Master Intake Valves (Set of 12)
Brand: Manley Performance
SKU: manley-performance-manley-nissan-patrol-40mm-race-master-intake-valves-set-of-12-t14-588457
Price: 525.79 USD
Availability: BackOrder

$525.79

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Nissan Patrol 40mm Race Master Intake Valves (Set of 12). Stainless steel construction for durability.

Key Features

Set includes 12 Manley Race Master intake valves.
Constructed from NK-842 stainless steel for durability.
Features chrome stems and hard tips for enhanced wear resistance.
Swirl polished under head areas and fully machined combustion faces optimize airflow.
Race Master (straight stem) design suits many racing engine requirements.
Recommended for alcohol engines, especially for exhaust valve applications.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

Starting with the NK-842 stainless steel alloy used for these Manley Race Master intake valves is a solid choice for serious engine builds. These aren't your everyday valves; they're built for engines that see a lot of action, especially those running up to 8000 RPM. If you're rebuilding the top end of your Nissan Patrol and pushing its performance, these valves are designed to handle the stress.

You'll notice the chrome stems and hard tips, which Manley adds to help them stand up to wear and tear over time, giving you more confidence in their longevity. The under-head areas are swirl polished, and the combustion faces are fully machined. This attention to detail helps improve airflow into the cylinder and can contribute to better combustion efficiency, which is key when you're looking for every bit of power.

Manley offers these in a Race Master straight stem design, which is a popular choice for many racing applications. They're also recommended for alcohol-fueled engines, particularly for exhaust valves, due to their robust construction. This set includes 12 intake valves, so you'll have what you need for a complete engine rebuild.