What makes the XH-432 XtremeAlloy material special for exhaust valves?

XH-432 XtremeAlloy is a specialized material chosen for its exceptional resistance to the extreme heat and pressures found in high-performance engines. It helps prevent valve distortion and failure under demanding conditions.

Are these valves suitable for a street-driven vehicle?

While these valves are built for extreme durability, they are primarily intended for specialized, high-stress applications like drag racing and marine use. For a typical street-driven vehicle, standard performance valves might be more appropriate unless your engine is heavily modified for extreme duty.

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

The swirl-polished finish on the underside of the valve head helps to smooth the airflow as it enters the combustion chamber. This can lead to improved volumetric efficiency and better overall combustion performance.

Specifications

Brand: Manley Performance
Part #: 12349-8
UPC: 807298086057

Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)

Name: Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-lt-1-1-590-head-diameter-pro-flo-exhaust-valves--t14-74650
Price: 596.61 USD
Availability: BackOrder

$596.61

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Manley Chevy LT-1 1.590" Head Exhaust Valves (Set of 8). Built for extreme heat and force applications.

Key Features

Fits Chevy LT-1 engines, specifically designed for 6.2L applications.
Set includes 8 exhaust valves, suitable for a V8 engine.
Features a 1.590 inch head diameter for optimized airflow.
Constructed from XH-432 XtremeAlloy, a material known for extreme heat and force resistance.
Chrome stems and hard tips are included for enhanced longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.

These valves are designed for Chevy LT-1 engines, particularly those in high-performance applications like Top Fuel drag racing, Funny Cars, and marine engines. Always confirm compatibility with your specific engine build.

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About this part

Product Details

If you're working on a high-performance Chevy LT-1 engine, especially one that sees extreme conditions like drag racing or marine use, these Manley Pro Flo exhaust valves are a solid choice. They're specifically designed for applications where intense heat and force are a constant factor, like in Top Fuel dragsters or powerful marine engines. These aren't your everyday valves; they're built to handle some serious abuse and keep performing.

The key to their durability is the XH-432 XtremeAlloy material Manley uses for the valve head. This is a well-known material for its ability to withstand extreme temperatures and pressures without deforming. On top of that, these valves feature chrome stems and hard tips, which significantly increases their resistance to wear and tear, especially where they meet the valve guide and rocker arm. You'll also notice the swirl-polished under-head areas and fully machined combustion faces. This design helps improve airflow into the cylinder, which can lead to better combustion efficiency and a bit more power from your engine.

This set includes eight exhaust valves, which is what you'll need for a standard V8 engine. When you're building an engine that pushes the limits, using components like these Manley valves is crucial for reliability and performance. Make sure to check the manufacturer's specifications for proper installation and any related components you might need for your specific build.