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Manley Severe Duty Series Stainless Steel Valves 12784-1 VALVE-S/D 2.300,+.200

SKU: MAN12784-1

Valves

Manley Severe Duty Series Stainless Steel Valves 12784-1 VALVE-S/D 2.300,+.200

SKU: MAN12784-1

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 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: 2026-09-29 08:03:22

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
12784-1
Product Attributes - Part Type
Valves
Product Attributes - Product Line
Manley Severe Duty Series Stainless Steel Valves
Product Attributes - UPC
807298001623
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.)
0.311 in.
Product Attributes - Intake Valve Stem Diameter (mm)
7.90mm
Product Attributes - Intake Overall Valve Length (in.)
5.444 in.
Product Attributes - Intake Overall Valve Length (mm)
138.278mm
Product Attributes - Undercut Stem
No
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
Stainless steel
Product Attributes - Lock Groove Quantity
1-groove
Product Attributes - Lock Groove Style
Beadlock
Product Attributes - Approximate Weight (g)
129
Product Attributes - Valve Head Style
5 degree dish
Product Attributes - Valve Seat Width (in.)
0.080 in.
Product Attributes - Quantity
Sold individually.
Product Attributes - Notes
Under head angle/radius 10 x 3/8 in. Valves are 0.200 in. longer than stock height. Beadlock valve locks are required.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man12784-1
SFX Item ID 4932853
Supplier Item Code 4932853
Manufacturer SKU 12784-1
Manufacturer UPC 807298001623

Compatibility

Application Data
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1965
    Ending Year1970
    Engine TypeV8
    Engine Size6.5L/396
    Engine FamilyChevy big block Mark IV
    Valve Installed Length0.200 in. over
    Cylinder Head TypeStock configuration
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyChevy big block Mark IV
    Valve Installed Length0.200 in. over
    Cylinder Head TypeStock configuration
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine Size6.6L/402
    Engine FamilyChevy big block Mark IV
    Valve Installed Length0.200 in. over
    Cylinder Head TypeStock configuration
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Mark IV
    Valve Installed Length0.200 in. over
    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 Length0.200 in. over
    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 Length0.200 in. over
    Cylinder Head TypeStock configuration

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