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Manley Severe Duty Series Stainless Steel Valves 12838-8 Valve, Intake, 2.325 in. Diameter, Steel, 0.250 in. Over Installed Length, Chevy, Big Block, Each
Manley Severe Duty Series Stainless Steel Valves 12838-8 Valve, Intake, 2.325 in. Diameter, Steel, 0.250 in. Over Installed Length, Chevy, Big Block, Each
A$615.99
Last Available from MFR.
LAST ONE AVAILABLE from the manufacturer's distribution centre. Once sold, this item may not be immediately available again. The dispatch timeframe shown is an estimate based on historical orders for this part and is dependent on the manufacturer releasing the final available unit.
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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
- 12838-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Series Stainless Steel Valves
- Product Attributes - UPC
- 807298005744
- Product Attributes - Valve Position
- Intake
- Product Attributes - Intake Valve Head Diameter (in.)
- 2.325 in.
- Product Attributes - Intake Valve Head Diameter (mm)
- 59.055mm
- Product Attributes - Intake Valve Stem Diameter (in.)
- 0.311 in.
- Product Attributes - Intake Valve Stem Diameter (mm)
- 7.90mm
- Product Attributes - Intake Overall Valve Length (in.)
- 5.494 in.
- Product Attributes - Intake Overall Valve Length (mm)
- 139.548mm
- Product Attributes - Undercut Stem
- No
- 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
- Beadlock
- Product Attributes - Approximate Weight (g)
- 134
- Product Attributes - Valve Head Style
- 5 degree dish
- Product Attributes - Valve Seat Width (in.)
- 0.080 in.
- Product Attributes - Quantity
- Sold as a set of 8.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man12838-8 |
| SFX Item ID | 4934208 |
| Supplier Item Code | 4934208 |
| Manufacturer SKU | 12838-8 |
| Manufacturer UPC | 807298005744 |
Compatibility
| Application Data |
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