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Manley Extreme Duty Series Stainless Steel Valves 11780-1 Valve, Intake, Steel, 2.300 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Each

SKU: MAN11780-1

Valves

Manley Extreme Duty Series Stainless Steel Valves 11780-1 Valve, Intake, Steel, 2.300 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Each

SKU: MAN11780-1

Valves
A$110.57
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 Extreme Duty Series performance steel valves are a great choice for supercharged, alcohol-burning, or high-revving engines. These engines generate a lot of heat and require special valves that can handle that kind of punishment. All valves are made from the best stainless steel available, with chrome stems and hardened valve tips. Extreme Duty Series valves are swirl-polished and fully machined and available with either undercut heads or straight stems.

Part Type

Valves

Data: v4.2 - Upd: 2026-10-14 10:07:19

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
11780-1
Product Attributes - Part Type
Valves
Product Attributes - Product Line
Manley Extreme Duty Series Stainless Steel Valves
Product Attributes - UPC
807298055343
Product Attributes - Valve Position
Intake
Product Attributes - Intake Valve Head Diameter (in.)
2.300 in.
Product Attributes - Intake Valve Head Diameter (mm)
58.420mm
Product Attributes - Intake Valve Stem Diameter (in.)
0.341 in.
Product Attributes - Intake Valve Stem Diameter (mm)
8.66mm
Product Attributes - Intake Overall Valve Length (in.)
5.244 in.
Product Attributes - Intake Overall Valve Length (mm)
133.198mm
Product Attributes - Undercut Stem
Yes
Product Attributes - Swirl-Polished
Yes
Product Attributes - Valve Tip Length (in.)
0.250 in.
Product Attributes - Valve Tip Length (mm)
6.350mm
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)
143
Product Attributes - Valve Head Style
7 degree dish
Product Attributes - Valve Seat Width (in.)
0.080 in.
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man11780-1
SFX Item ID 4931876
Supplier Item Code 4931876
Manufacturer SKU 11780-1
Manufacturer UPC 807298055343

Compatibility

Application Data
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Mark IV
    Valve Installed LengthStock
    Cylinder Head TypeStock configuration
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1991
    Ending Year1995
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Gen V
    Valve Installed LengthStock
    Cylinder Head TypeStock configuration
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1996
    Ending Year2000
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Gen VI
    Valve Installed LengthStock
    Cylinder Head TypeStock configuration

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