Manley Performance
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Manley Severe Duty Pro Flo Series Stainless Steel Valves 11554-8 Valve, Intake, Steel, 2.065 in. Diameter, .372 in. Stem, 5.325 in. Length, Set of 8
Manley Severe Duty Pro Flo Series Stainless Steel Valves 11554-8 Valve, Intake, Steel, 2.065 in. Diameter, .372 in. Stem, 5.325 in. Length, Set of 8
A$618.99
LAST ONE! Est Ship 4-7 days.
LAST ONE! This is the last unit at our distribution centre. Contact us if you need more. The ETA is the approximate time required to prepare your order for dispatch.
We accept
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
- 11554-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Pro Flo Series Stainless Steel Valves
- Product Attributes - UPC
- 807298050140
- Product Attributes - Valve Position
- Intake
- Product Attributes - Intake Valve Head Diameter (in.)
- 2.065 in.
- Product Attributes - Intake Valve Head Diameter (mm)
- 52.451mm
- Product Attributes - Intake Valve Stem Diameter (in.)
- 0.372 in.
- Product Attributes - Intake Valve Stem Diameter (mm)
- 9.44mm
- Product Attributes - Intake Overall Valve Length (in.)
- 5.325 in.
- Product Attributes - Intake Overall Valve Length (mm)
- 135.255mm
- Product Attributes - Undercut Stem
- Yes
- Product Attributes - Swirl-Polished
- Yes
- Product Attributes - Valve Tip Length (in.)
- 0.220 in.
- Product Attributes - Valve Tip Length (mm)
- 5.588mm
- Product Attributes - Valve Material
- NK-844 stainless steel
- Product Attributes - Lock Groove Quantity
- 1-groove
- Product Attributes - Lock Groove Style
- Conventional
- Product Attributes - Approximate Weight (g)
- 138
- Product Attributes - Valve Head Style
- 7 degree dish
- Product Attributes - Valve Seat Width (in.)
- 0.080 in.
- Product Attributes - Quantity
- Sold as a set of 8.
- Product Attributes - Notes
- Underhead angle/radius 12 x .438 in. Margin 0.065 in.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man11554-8 |
| SFX Item ID | 4927369 |
| Supplier Item Code | 4927369 |
| Manufacturer SKU | 11554-8 |
| Manufacturer UPC | 807298050140 |
Compatibility
| Application Data |
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