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Manley Severe Duty Series Stainless Steel Valves 12342-8 Valve, Intake, Steel, 1.720 in. Head, 0.342 in. Stem, 4.911 in. Length, Chevy, Set of 8
Manley Severe Duty Series Stainless Steel Valves 12342-8 Valve, Intake, Steel, 1.720 in. Head, 0.342 in. Stem, 4.911 in. Length, Chevy, Set of 8
A$612.80
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Description
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.
Part Type
Engine Intake Valve
Features
- Chrome stems and hard tips enhance durability
- Exotic alloys for superior tensile strength, reliability, and longevity
- Proven fatigue strength for extreme performance
- Swirl polishing and machined faces improved airflow/optimized efficiency
Specifications
- Product Attributes - Brand
- Manley
- Product Attributes - Manufacturer's Part Number
- 12342-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Series Stainless Steel Valves
- Product Attributes - UPC
- 807298083643
- Product Attributes - Valve Position
- Intake
- Product Attributes - Intake Valve Head Diameter (in.)
- 1.720 in.
- Product Attributes - Intake Valve Head Diameter (mm)
- 43.688mm
- Product Attributes - Intake Valve Stem Diameter (in.)
- 0.342 in.
- Product Attributes - Intake Valve Stem Diameter (mm)
- 8.69mm
- Product Attributes - Intake Overall Valve Length (in.)
- 4.911 in.
- Product Attributes - Intake Overall Valve Length (mm)
- 124.739mm
- Product Attributes - Undercut Stem
- Yes
- Product Attributes - Swirl-Polished
- Yes
- Product Attributes - Valve Tip Length (in.)
- 0.250 in.
- Product Attributes - Valve Tip Length (mm)
- 6.350mm
- Product Attributes - Valve Material
- Stainless steel
- Product Attributes - Lock Groove Quantity
- 1-groove
- Product Attributes - Lock Groove Style
- Conventional
- Product Attributes - Valve Head Style
- 5 degree dish
- Product Attributes - Quantity
- Sold as a set of 8.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man12342-8 |
| SFX Item ID | 4931454 |
| Supplier Item Code | 4931454 |
| Manufacturer SKU | 12342-8 |
| Manufacturer UPC | 807298083643 |
Compatibility
| Application Data |
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