What is the primary benefit of the swirl polished under-head area?

The swirl polished under-head area helps to smooth the airflow as it enters the combustion chamber. This can lead to improved combustion efficiency and better overall engine performance.

Are these valves suitable for street use or only racing?

These valves are part of Manley's Race Series, designed for demanding racing applications like bracket, drag, and oval track use, typically up to 8000 RPM. While durable, they are optimized for high-performance scenarios.

What does 'Race Master' shape refer to?

The 'Race Master' designation refers to the straight stem design of these valves. Manley also offers a 'Race Flo' shape with a different stem profile, so ensure the Race Master shape is compatible with your cylinder head and valve train setup.

Specifications

Brand: Manley Performance
Part #: 12333B-8
UPC: 807298079424

Manley 12-14 Chrysler Hemi 6.4L 1.675in Head Dia Race Master Exhaust Valves (Set of 8)

Name: Manley 12-14 Chrysler Hemi 6.4L 1.675in Head Dia Race Master Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-12-14-chrysler-hemi-6-4l-1-675in-head-dia-race-master--t14-424900
Price: 235.06 USD
Availability: BackOrder

$235.06

On Backorder

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

Manley Race Master exhaust valves for Chrysler Hemi 6.4L engines. Stainless steel construction for durability.

Key Features

Fits Chrysler Hemi 6.4L engines.
Set of 8 Race Master exhaust valves with a 1.675-inch head diameter.
Constructed from durable stainless steel for long-lasting performance.
Chrome stems and hard tips enhance wear resistance and longevity.
Swirl polished under-head areas and fully machined combustion faces improve airflow and efficiency.
Recommended for use in alcohol engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the top end of your Chrysler Hemi 6.4L engine, especially for racing applications, you'll want to consider these Manley Race Master exhaust valves. These are built for engines that see a lot of action, typically running up to 8000 RPM, making them a solid choice for bracket, drag, or oval track use.

What sets these apart is the material and machining. They're made from a high-quality stainless steel that holds up well over time, and the stems are chromed with hard tips to resist wear. The under-head area is swirl polished to help smooth out airflow, and the combustion face is fully machined. This attention to detail helps optimize how efficiently your engine breathes and burns fuel. Manley also recommends these for alcohol-fueled engines, which can be pretty demanding on exhaust components.

This set includes eight exhaust valves, and they feature a straight stem design, which Manley calls the Race Master shape. Make sure these match the specific requirements for your cylinder head porting and valve train setup.