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Manley Performance

Manley Performance

Manley Race Master Valves 12303-8 VALVE-R/M 1.600, +.100, .3136 STEM

SKU: MAN12303-8

Valves
Manley Race Master Valves 12303-8 VALVE-R/M 1.600, +.100, .3136 STEM
Manley Performance

Manley Performance

Manley Race Master Valves 12303-8 VALVE-R/M 1.600, +.100, .3136 STEM

SKU: MAN12303-8

Valves
A$416.48
Last Available from MFR. LAST ONE AVAILABLE from the manufacturer's distribution centre. Once sold, this item may not be immediately available again. The dispatch timeframe shown is an estimate based on historical orders for this part and is dependent on the manufacturer releasing the final available unit.
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Description

Manley Race Series valves are meticulously engineered to meet the rigorous demands of bracket, drag, and oval track racers and are the ultimate choice for engines operating under 8000 RPM.

Part Type

Engine Exhaust Valve

Data: v4.2 - Upd: 2026-10-14 10:11:40

Features

  • Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity and wear resistance.
  • Recommended for Alcohol Engines: These valves are the recommended choice for exhaust valves in alcohol engines, ensuring reliable performance even in demanding conditions.
  • Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.
  • Swirl Polished and Fully Machined: The valves feature swirl polished under head areas and fully machined combustion faces to optimize airflow and combustion efficiency.
  • Variety of Shapes: Choose between Race Master (Straight Stem) and Race Flo shapes to suit your racing engine's specific requirements.

Specifications

Product Attributes - Brand
Manley
Product Attributes - Manufacturer's Part Number
12303-8
Product Attributes - Part Type
Valves
Product Attributes - Product Line
Manley Race Master Valves
Product Attributes - UPC
807298072753
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)
7.97mm
Product Attributes - Exhaust Overall Valve Length (in.)
5.050 in.
Product Attributes - Exhaust Overall Valve Length (mm)
128.270mm
Product Attributes - Undercut Stem
No
Product Attributes - Swirl-Polished
Yes
Product Attributes - Valve Tip Length (in.)
0.260 in.
Product Attributes - Valve Tip Length (mm)
6.604mm
Product Attributes - Valve Material
Stainless steel
Product Attributes - Lock Groove Quantity
1-groove
Product Attributes - Lock Groove Style
Conventional
Product Attributes - Approximate Weight (g)
95
Product Attributes - Valve Head Style
18 degree dish
Product Attributes - Valve Seat Width (in.)
0.100 in.
Product Attributes - Quantity
Sold as a set of 8.
Product Attributes - Notes
Fits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.

Reference Information

Brand Name/s Manley Performance
StreetFX SKU man12303-8
SFX Item ID 4927887
Supplier Item Code 4927887
Manufacturer SKU 12303-8
Manufacturer UPC 807298072753

Compatibility

Application Data
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1955
    Ending Year1957
    Engine TypeV8
    Engine Size4.3L/265
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1957
    Ending Year1967
    Engine TypeV8
    Engine Size4.6L/283
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1962
    Ending Year1969
    Engine TypeV8
    Engine Size5.3L/327
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1964
    Ending Year1967
    Engine TypeV8
    Engine Size5.4L/327
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1967
    Ending Year1969
    Engine TypeV8
    Engine Size4.9L/302
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1967
    Ending Year2002
    Engine TypeV8
    Engine Size5.7L/350
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1968
    Ending Year1973
    Engine TypeV8
    Engine Size5.0L/307
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1980
    Engine TypeV8
    Engine Size6.6L/400
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1975
    Ending Year1976
    Engine TypeV8
    Engine Size4.3L/262
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1976
    Ending Year2002
    Engine TypeV8
    Engine Size5.0L/305
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.
  • Valve FitmentSearch by engine
    MakeCHEVROLET
    Beginning Year1979
    Ending Year1982
    Engine TypeV8
    Engine Size4.4L/267
    Engine FamilyChevy small block Gen I
    Valve Installed Length0.100 in. over
    Cylinder Head TypeAFR
    Application NotesFits AFR 180cc, 190cc,195cc,210cc, 220cc, 227cc, 235cc, 245cc Series Small block Chevrolet Heads.

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