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Autolite Copper Core Spark Plugs 303 Plug, Core, Gasket Seat, 14mm Thread, 0.375 in. Reach, Resistor, Each

SKU: ATL303

Spark Plugs

Autolite Copper Core Spark Plugs 303 Plug, Core, Gasket Seat, 14mm Thread, 0.375 in. Reach, Resistor, Each

SKU: ATL303

Spark Plugs
A$12.64
IN STOCK! Est Ship 3-7 Days days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

Autolite copper core spark plugs feature a cold-formed steel shell with precision-rolled threads, a full copper core electrode for better performance, and a one-piece terminal post to add strength. The ignition plugs use a copper-glass seal that bonds the insulator and terminal post center electrode together. This ensures full voltage at the spark gap and a 100 percent leak-proof, gas-tight seal. Autolite features an extensive application guide to cover just about everything with an internal combustion engine. Keep your engine running smoothly and reliably with Autolite replacement copper core spark plugs.

Part Type

Spark Plug

Data: v4.2 - Upd: 2026-10-08 16:48:49

Specifications

Product Attributes - Brand
Autolite
Product Attributes - Manufacturer's Part Number
303
Product Attributes - Part Type
Spark Plugs
Product Attributes - Product Line
Autolite Copper Core Spark Plugs
Product Attributes - UPC
00009100003034
Product Attributes - Spark Plug Thread Size
14mm
Product Attributes - Spark Plug Reach (in.)
0.375 in.
Product Attributes - Spark Plug Reach (mm)
9.53mm
Product Attributes - Manufacturer Heat Range
3
Product Attributes - Shorty Spark Plug
No
Product Attributes - Resistor
Yes
Product Attributes - Electrode Tip Material
Copper
Product Attributes - Electrode Core Material
Copper
Product Attributes - Center Electrode Type
Projected
Product Attributes - Spark Plug Seat Style
Gasket
Product Attributes - Wrench Diameter
13/16 in.
Product Attributes - Ground Strap Quantity
One
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Autolite
StreetFX SKU atl303
SFX Item ID 5177241
Supplier Item Code 5177241
Manufacturer SKU 303
Manufacturer UPC 9100003034
Alternative References AUT303, 14mm

Compatibility

Application Data
  • UniversalNo
    MakeCHEVROLET
    Model1500
    SubmodelBASE
    Beginning Year1954
    Ending Year1954
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    Model1500
    SubmodelBASE
    Beginning Year1954
    Ending Year1954
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelBEL AIR
    SubmodelBASE
    Beginning Year1959
    Ending Year1959
    Engine TypeV8
    Engine FamilyBuick V8
    Engine Size5.3L/322
  • UniversalNo
    MakeCHEVROLET
    ModelBEL AIR
    SubmodelBASE
    Beginning Year1959
    Ending Year1960
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelBK
    SubmodelBASE
    Beginning Year1946
    Ending Year1946
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    ModelBLAZER
    SubmodelBASE
    Beginning Year1969
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PANEL
    SubmodelBASE
    Beginning Year1960
    Ending Year1962
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.9L/235
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PICKUP
    SubmodelBASE
    Beginning Year1960
    Ending Year1961
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PICKUP
    SubmodelBASE
    Beginning Year1961
    Ending Year1962
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PICKUP
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.4L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PICKUP
    SubmodelBASE
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC10 PICKUP
    SubmodelBASE
    Beginning Year1969
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
  • UniversalNo
    MakeCHEVROLET
    ModelC10 SUBURBAN
    SubmodelBASE
    Beginning Year1960
    Ending Year1961
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    ModelC10 SUBURBAN
    SubmodelBASE
    Beginning Year1961
    Ending Year1962
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelC10 SUBURBAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC10 SUBURBAN
    SubmodelBASE
    Beginning Year1968
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.4L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC10 SUBURBAN
    SubmodelBASE
    Beginning Year1969
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
  • UniversalNo
    MakeCHEVROLET
    ModelC20 PICKUP
    SubmodelBASE
    Beginning Year1960
    Ending Year1961
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    ModelC20 PICKUP
    SubmodelBASE
    Beginning Year1961
    Ending Year1962
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelC20 PICKUP
    SubmodelBASE
    Beginning Year1966
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.4L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC20 PICKUP
    SubmodelBASE
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
  • UniversalNo
    MakeCHEVROLET
    ModelC20 PICKUP
    SubmodelBASE
    Beginning Year1969
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
  • UniversalNo
    MakeCHEVROLET
    ModelC20 SUBURBAN
    SubmodelBASE
    Beginning Year1960
    Ending Year1961
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size3.8L/235
  • UniversalNo
    MakeCHEVROLET
    ModelC20 SUBURBAN
    SubmodelBASE
    Beginning Year1961
    Ending Year1962
    Engine TypeL6
    Engine FamilyGM inline 6-cylinder
    Engine Size4.3L/261
  • UniversalNo
    MakeCHEVROLET
    ModelC20 SUBURBAN
    SubmodelBASE
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327

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