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Manley Severe Duty Pro Flo Series Stainless Steel Valves 11688H-8 Valves, Series, Intake, Hollow Stem, NK-844 Stainless, 1-groove, Chevy, Set of 8
Manley Severe Duty Pro Flo Series Stainless Steel Valves 11688H-8 Valves, Series, Intake, Hollow Stem, NK-844 Stainless, 1-groove, Chevy, Set of 8
A$1,360.63
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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
- 11688H-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Pro Flo Series Stainless Steel Valves
- Product Attributes - UPC
- 807298069753
- Product Attributes - Valve Position
- Intake
- Product Attributes - Intake Valve Head Diameter (in.)
- 2.205 in.
- Product Attributes - Intake Valve Head Diameter (mm)
- 56.007mm
- Product Attributes - Intake Valve Stem Diameter (in.)
- 0.313 in.
- Product Attributes - Intake Valve Stem Diameter (mm)
- 7.95mm
- Product Attributes - Intake Overall Valve Length (in.)
- 5.200 in.
- Product Attributes - Intake Overall Valve Length (mm)
- 132.080mm
- Product Attributes - Undercut Stem
- Yes
- Product Attributes - Swirl-Polished
- Yes
- Product Attributes - Valve Tip Length (in.)
- 0.300 in.
- Product Attributes - Valve Tip Length (mm)
- 7.620mm
- 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)
- 110
- Product Attributes - Valve Head Style
- 7 degree dish
- Product Attributes - Valve Seat Width (in.)
- 0.085 in.
- Product Attributes - Quantity
- Sold as a set of 8.
- Product Attributes - Notes
- Hollow stem valves.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man11688H-8 |
| SFX Item ID | 4930579 |
| Supplier Item Code | 4930579 |
| Manufacturer SKU | 11688H-8 |
| Manufacturer UPC | 807298069753 |
| Alternative References | NK-844, 1-groove |
Compatibility
| Application Data |
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|---|
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