Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.
Head Diameter: 2.165 in. - Stem Diameter: 0.3133 in. - O/A : 4.900 in.
| Air Freight Prohibited: false |
| Not Carb Approved: false |
| Carb Acknowledgement Required: false |
| Ltl Freight Required: false |
| Prop 65: Y |
| Part Type: automotive |
| Epa: N/A |
| Regular Stock: false |
| Units Per Sku: 1 |
| Years | Make | Model | Trim |
|---|---|---|---|
| 2007–2008 | Cadillac | Escalade | |
| 2010–2015 | Chevrolet | Camaro | SS |
| 2008–2013 | Chevrolet | Corvette | |
| 2009–2013 | Chevrolet | Silverado 1500 | |
| 2009 | Chevrolet | Tahoe | |
| 2009–2013 | GMC | Sierra 1500 | |
| 2007–2013 | GMC | Sierra Denali | |
| 2007–2013 | GMC | Yukon Denali | |
| 2008–2009 | Hummer | H2 |
No fitment data available for this product.
This product is covered by the manufacturer's warranty against product defects and missing components in the package. To file a claim, use the brand-specific links on our warranty page.
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