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Manley Severe Duty Series Stainless Steel Valves 11553-8 Valves, Exhaust, XH-428 Steel, 1.720 in. Diameter, .372 in. Stem, 5.354 in. Length, Set of 8
Manley Severe Duty Series Stainless Steel Valves 11553-8 Valves, Exhaust, XH-428 Steel, 1.720 in. Diameter, .372 in. Stem, 5.354 in. Length, Set of 8
A$589.63
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 Exhaust 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
- 11553-8
- Product Attributes - Part Type
- Valves
- Product Attributes - Product Line
- Manley Severe Duty Series Stainless Steel Valves
- Product Attributes - UPC
- 807298050126
- Product Attributes - Valve Position
- Exhaust
- Product Attributes - Exhaust Valve Head Diameter (in.)
- 1.720 in.
- Product Attributes - Exhaust Valve Head Diameter (mm)
- 43.688mm
- Product Attributes - Exhaust Valve Stem Diameter (in.)
- 0.372 in.
- Product Attributes - Exhaust Valve Stem Diameter (mm)
- 9.44mm
- Product Attributes - Exhaust Overall Valve Length (in.)
- 5.354 in.
- Product Attributes - Exhaust Overall Valve Length (mm)
- 135.992mm
- Product Attributes - Undercut Stem
- No
- 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
- XH-428 stainless steel
- Product Attributes - Lock Groove Quantity
- 1-groove
- Product Attributes - Lock Groove Style
- Conventional
- Product Attributes - Approximate Weight (g)
- 122
- Product Attributes - Valve Head Style
- 6 degree dish
- Product Attributes - Valve Seat Width (in.)
- 0.100 in.
- Product Attributes - Quantity
- Sold as a set of 8.
- Product Attributes - Notes
- Underhead angle/radius 10 x .375 in. Margin 0.065 in.
Reference Information
| Brand Name/s | Manley Performance |
|---|---|
| StreetFX SKU | man11553-8 |
| SFX Item ID | 4929550 |
| Supplier Item Code | 4929550 |
| Manufacturer SKU | 11553-8 |
| Manufacturer UPC | 807298050126 |
| Alternative References | XH-428 |
Compatibility
| Application Data |
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