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Manley Severe Duty Pro Flo Series Stainless Steel Valves 11682-1 Valves, Intake, XH-428 Stainless, 2.080 in. Head Diameter, 4.874 in. Length, Chevy, 5.7, 6.0L, Set of 8

SKU: MAN11682-1

Valves

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11682-1 Valves, Intake, XH-428 Stainless, 2.080 in. Head Diameter, 4.874 in. Length, Chevy, 5.7, 6.0L, Set of 8

SKU: MAN11682-1

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 Pro Flo Series intake and exhaust 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 fully machined and swirl polished, and offer improved flow with undercut "Pro Flo" stems. Many size options are available, for applications from 1955 and up.

Part Type

Valves

Data: v4.2 - Upd: 2026-10-14 10:09:36

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
11682-1
Product Attributes - Part Type
Valves
Product Attributes - Product Line
Manley Severe Duty Pro Flo Series Stainless Steel Valves
Product Attributes - UPC
807298051512
Product Attributes - Valve Position
Intake
Product Attributes - Intake Valve Head Diameter (in.)
2.080 in.
Product Attributes - Intake Valve Head Diameter (mm)
52.800mm
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.)
4.874 in.
Product Attributes - Intake Overall Valve Length (mm)
123.800mm
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-428 stainless steel
Product Attributes - Lock Groove Quantity
1-groove
Product Attributes - Lock Groove Style
Conventional
Product Attributes - Approximate Weight (g)
108
Product Attributes - Valve Head Style
7 degree dish
Product Attributes - Valve Seat Width (in.)
0.095 in.
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man11682-1
SFX Item ID 4929908
Supplier Item Code 4929908
Manufacturer SKU 11682-1
Manufacturer UPC 807298051512
Alternative References XH-428, 6.0L

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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