What makes Manley's Severe Duty valves different from standard valves?

Manley's Severe Duty valves are made from specialized alloys like XH-428 for exhaust, which has significantly higher tensile strength at high temperatures compared to common materials. They also undergo rigorous fatigue testing to ensure extreme durability, enduring millions more cycles than competitor valves.

What is the benefit of the XH-428 material for exhaust valves?

XH-428 material provides nearly double the ultimate tensile strength at 1500°F compared to materials like EV-8. This allows the valves to better withstand the intense heat and stress found in high-performance and high-temperature gasoline engines, leading to improved longevity.

Do these valves come with any specific installation recommendations?

While these valves are designed for direct fitment in SBC engines, it is always recommended to refer to the manufacturer's installation instructions or consult a professional mechanic for proper installation procedures and any specific requirements for your engine build.

Specifications

Brand: Manley Performance
Part #: 11771-8
UPC: 807298018706

Manley SBC 1.600 Severe Duty Exhaust Valves (Set of 8)

Name: Manley SBC 1.600 Severe Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-sbc-1-600-severe-duty-exhaust-valves-set-of-8-t14-4364009
Price: 349.40 USD
Availability: BackOrder

$349.40

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

Manley SBC 1.600" Severe Duty Exhaust Valves (Set of 8). Built for high-temperature gasoline engines and extreme stress.

Key Features

Set of 8 exhaust valves for Small Block Chevy engines.
Constructed from XH-428 material, offering exceptional high-temperature tensile strength.
Tested to withstand up to 100 million cycles under extreme stress and heat (1400°F).
Features chrome stems and hard tips for improved durability and longevity.
Swirl-polished under-head areas and fully machined combustion faces enhance airflow and combustion efficiency.
Designed for high-temperature gasoline engines.

These valves are designed for Small Block Chevy (SBC) engines. Always consult your engine's specific service manual for compatibility and installation details.

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About this part

Product Details

If you're rebuilding a Small Block Chevy engine, especially for demanding street or racing applications, you need exhaust valves that can handle the heat and stress. These Manley Severe Duty exhaust valves are built from XH-428 material, a special alloy that offers nearly double the tensile strength at high temperatures compared to common competitor materials like EV-8. This means they're designed to last under extreme conditions.

Manley put these valves through some serious testing. In fatigue tests simulating bouncing on the seat, which can put 40,000 to 60,000 lbs of stress on a valve, these exhaust valves endured up to 100 million cycles at 1400°F. For comparison, other valves failed after just 100,000 cycles. They also feature chrome stems and hard tips for added durability, and the swirl-polished under-head areas and machined faces help improve airflow into the combustion chamber.

This set includes eight exhaust valves, enough for a standard V8 engine. They are specifically designed for high-temperature gasoline engines, making them a solid choice when you need reliable performance and longevity from your valvetrain.