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Manley Performance

Manley Performance

Manley Severe Duty Series Stainless Steel Valves 11677-1 Valve, Duty, XH-426 Steel, Exhaust, 1.600 in. Diameter, 4.923 in. Length, Each

SKU: MAN11677-1

Valves
Manley Severe Duty Series Stainless Steel Valves 11677-1 Valve, Duty, XH-426 Steel, Exhaust, 1.600 in. Diameter, 4.923 in. Length, Each
Manley Performance

Manley Performance

Manley Severe Duty Series Stainless Steel Valves 11677-1 Valve, Duty, XH-426 Steel, Exhaust, 1.600 in. Diameter, 4.923 in. Length, Each

SKU: MAN11677-1

Valves
A$108.05
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.
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Description

Manley Severe Duty series performance valves are a great choice for your high performance or race engine. All valves are made from stainless steel (intakes are NK-844; exhausts are XH-428) with chrome stems and hardened valve tips. Severe Duty series valves are made of superior materials, are fully machined and swirl polished, and are available with either undercut "Pro Flo" stems or straight stems.

Part Type

Valves

Data: v4.2 - Upd: 2026-10-14 10:10:44

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
11677-1
Product Attributes - Part Type
Valves
Product Attributes - Product Line
Manley Severe Duty Series Stainless Steel Valves
Product Attributes - UPC
807298062969
Product Attributes - Valve Position
Exhaust
Product Attributes - Exhaust Valve Head Diameter (in.)
1.600 in.
Product Attributes - Exhaust Valve Head Diameter (mm)
40.640mm
Product Attributes - Exhaust Valve Stem Diameter (in.)
0.314 in.
Product Attributes - Exhaust Valve Stem Diameter (mm)
7.96mm
Product Attributes - Exhaust Overall Valve Length (in.)
4.923 in.
Product Attributes - Exhaust Overall Valve Length (mm)
125.044mm
Product Attributes - Undercut Stem
Yes
Product Attributes - Swirl-Polished
Yes
Product Attributes - Valve Tip Length (in.)
0.175 in.
Product Attributes - Valve Tip Length (mm)
4.445mm
Product Attributes - Valve Material
XH-426 stainless steel
Product Attributes - Lock Groove Quantity
1-groove
Product Attributes - Lock Groove Style
Conventional
Product Attributes - Approximate Weight (g)
92
Product Attributes - Valve Head Style
18 degree dish
Product Attributes - Valve Seat Width (in.)
0.115 in.
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man11677-1
SFX Item ID 4928809
Supplier Item Code 4928809
Manufacturer SKU 11677-1
Manufacturer UPC 807298062969
Alternative References XH-426

Compatibility

Application Data
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1997
    Ending Year2004
    Engine TypeV8
    Engine Size5.7L/350
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Valve Installed LengthStock
    Cylinder Head TypeLS6
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1997
    Ending Year2004
    Engine TypeV8
    Engine Size5.7L/350
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Valve Installed LengthStock
    Cylinder Head TypeTrick Flow Gen X
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year2005
    Ending Year2009
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Valve Installed LengthStock
    Cylinder Head TypeLS6
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year2005
    Ending Year2009
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    Valve Installed LengthStock
    Cylinder Head TypeTrick Flow Gen X

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