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Manley Severe Duty Series Stainless Steel Valves 12878-8 Valve, Intake, Steel, 2.300 in. Head Diameter, 5.594 in. Length, Chevy, Big Block, Set of 8
Manley Severe Duty Series Stainless Steel Valves 12878-8 Valve, Intake, Steel, 2.300 in. Head Diameter, 5.594 in. Length, Chevy, Big Block, Set of 8
A$615.99
Limited Availability from MFR
Limited stock available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical orders of this part. This item is not held in our own warehouse, and availability and release timing may vary depending on manufacturer stock movements and processing at the time of ordering.
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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
- 12878-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Series Stainless Steel Valves
- Product Attributes - UPC
- 807298105208
- Product Attributes - Valve Position
- Intake
- Product Attributes - Intake Valve Head Diameter (in.)
- 2.300 in.
- Product Attributes - Intake Valve Head Diameter (mm)
- 58.420mm
- 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.)
- 5.594 in.
- Product Attributes - Intake Overall Valve Length (mm)
- 142.088mm
- 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)
- 133
- 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.
- Product Attributes - Notes
- Under head angle/radius 10 x 3/8 in.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man12878-8 |
| SFX Item ID | 4930994 |
| Supplier Item Code | 4930994 |
| Manufacturer SKU | 12878-8 |
| Manufacturer UPC | 807298105208 |
Compatibility
| Application Data |
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