What kind of applications are these valves best suited for?

These valves are specifically designed for extreme applications where high force and heat resistance are critical. This includes Top Fuel and Funny Car drag racing, marine engines, and circle track racing with restricted carburetors.

What makes the XH-432 XtremeAlloy material special?

XH-432 XtremeAlloy is Manley's hallmark material for exhaust valves, known for its exceptional ability to withstand extreme temperatures and stresses encountered in high-performance and racing engines.

Are any installation hardware or other components included with these valves?

This product is a set of 8 exhaust valves. Other necessary engine components for installation, such as valve springs, retainers, or seals, are sold separately.

Specifications

Brand: Manley Performance
Part #: 11685-8
UPC: 807298051123

Manley Chevy LS-3/L-99 Small Block (L-92 Head) Extreme Duty Exhaust Valves (Set of 8)

Name: Manley Chevy LS-3/L-99 Small Block (L-92 Head) Extreme Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-3-l-99-small-block-l-92-head-extreme-duty-exh-t14-4332887
Price: 596.61 USD
Availability: BackOrder

$596.61

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Manley Chevy LS-3/L-99 Small Block (L-92 Head) Extreme Duty Exhaust Valves (Set of 8). Built for extreme heat and force with XH-432 XtremeAlloy.

Key Features

Fits Chevy LS-3/L-99 Small Block engines with L-92 heads.
Set includes 8 exhaust valves.
Constructed from XH-432 XtremeAlloy for extreme heat and force resistance.
Chrome stems and hard tips offer exceptional longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.
Head Diameter: 1.590 in.

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About this part

Product Details

Manley Performance is known for making tough engine components for racing and high-performance applications. These Extreme Duty Series exhaust valves are a prime example, built to handle the intense conditions found in Top Fuel drag racing, marine engines, and restricted carburetor circle track racing. If your Small Block Chevy, specifically an LS-3 or L-99 with L-92 heads, is seeing extreme force and heat, these valves are designed to keep up.

The key to their durability is the XH-432 XtremeAlloy material Manley uses for the valve head. This is a well-known material for handling high temperatures and stress. On top of that, the stems are treated with chrome, and the tips are hardened, which significantly increases their resistance to wear over time. You'll also see that the under-head area is swirl polished, and the combustion face is fully machined. These details help improve airflow into the cylinder and contribute to more efficient combustion.

This set includes eight exhaust valves, each measuring 1.590 inches in head diameter, with a 0.3136-inch stem diameter and an overall length of 4.923 inches. They are a solid option when you need engine components that can withstand the most demanding environments.