Specifications
- Brand
- Manley Performance
- Part #
- 12355-8
- UPC
- 807298105932

Manley Chevy Small Block LS3/L99 (L92 Head) 1.6in Head Dia. Severe Duty Exhaust Valves (Set of 8)
$349.40
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Manley Severe Duty exhaust valves for Chevy LS3/L99 (L92 Head) engines. Made from XH-428 material for extreme durability.
Key Features
- Fits Chevy Small Block LS3 and L99 engines with L92 heads.
- Set of 8 severe duty exhaust valves.
- Exhaust valves are made from XH-428 material for high-temperature strength.
- Head diameter is 1.600 inches.
- Stem diameter is 0.3136 inches.
- Overall length is 5.215 inches.
Product Details
Manley Performance is well-known for making strong engine components, and these Severe Duty? exhaust valves are a prime example. If you're working on a Chevy Small Block LS3 or L99 engine with L92 heads, these valves are built to handle the heat and stress of high-performance gasoline applications.
These exhaust valves are crafted from XH-428 material, which Manley states has nearly double the ultimate tensile strength at 1500?F compared to competing EV-8 materials. They've been put through rigorous fatigue tests, enduring up to 100 million cycles at 40,000 psi and 1400?F, which is a notable improvement over other valves that failed much sooner. The design includes swirl-polished under-head areas and fully machined combustion faces to help improve airflow and combustion efficiency. They also feature chrome stems and hard tips for added durability.
This set includes 8 exhaust valves, each with a 1.600-inch head diameter and a 0.3136-inch stem diameter, with an overall length of 5.215 inches. These are designed as direct replacements for your engine's exhaust valves.
Specifications
- Brand
- Manley Performance
- Manufacturer Part #
- 12355-8
- UPC
- 807298105932
Frequently Asked Questions
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Manley Chevy Small Block LS3/L99 (L92 Head) 1.6in Head Dia. Severe Duty Exhaust Valves (Set of 8)
