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NGK Spark Plugs XR4IX

Iridium IX Spark Plug 14mm x 3/8" Reach

NGK Spark Plugs XR4IX

739-XR4IX

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NGK Spark Plugs XR4IX Iridium IX Spark Plug 14mm x 3/8" Reach $8.99
Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually

  • Specifications:

    Manufacturer's Part Number:
    XR4IX

    The Plug for Serious Enthusiasts
    Iridium has a very high melting point that's perfect for high-performance, high-tech engines. It is stronger than any other metal used in spark plugs.

  • Ultra-fine electrode (thin enough for spark consistency & accuracy, thick enough for max durability & longevity)
  • Reduces spark voltage requirement
  • Fuel efficiency & extreme ignitability
  • Improved throttle response
  • Outstanding acceleration
  • Superior antifouling, anticorrosion, and antiseizing properties
  • Quality NGK Spark Plugs
  • Sold individually

  • Does NGK Spark Plugs XR4IX fit your vehicle?

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    Aspiration

    1959-1960 PONTIAC CATALINA

    • EngineType: ALL
    • SubModel: ALL

    1968 DODGE CORONET

    • CC: 6286
    • Liter: 6.3
    • SubModel: 440
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1965-1967 CHEVROLET CHEVELLE

    • Liter: 4.6
    • SubModel: DELUXE
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )

    1967 CADILLAC ELDORADO

    • EngineType: ALL
    • SubModel: ALL

    1966 DODGE MONACO

    • CC: 7211
    • Liter: 7.2
    • SubModel: BASE
    • CUI: 440
    • EngineType: V8 ( 7.2 L / 440 )

    1969 PONTIAC CATALINA

    • Liter: 7.0
    • SubModel: SAFARI
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1972 OLDSMOBILE CUTLASS

    • EngineType: ALL
    • SubModel: CRUISER

    1964-1965 PONTIAC TEMPEST

    • CC: 5343
    • Liter: 5.3
    • SubModel: CUSTOM
    • CUI: 326
    • EngineType: V8 ( 5.3 L / 326 )

    1967-1969 PONTIAC EXECUTIVE

    • Liter: 7.0
    • SubModel: SAFARI
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1969 DODGE MONACO

    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1963 DODGE 880

    • Liter: 6.8
    • SubModel: CUSTOM
    • CUI: 413
    • EngineType: V8 ( 6.8 L / 413 )

    1955 PLYMOUTH SAVOY

    • Liter: 4.2
    • SubModel: BASE
    • CUI: 259
    • EngineType: V8 ( 4.2 L / 259 )

    1965-1967 DODGE CORONET

    • Liter: 5.2
    • SubModel: 500
    • CUI: 318
    • EngineType: V8 ( 5.2 L / 318 )

    1962-1969 CHEVROLET BISCAYNE

    • Liter: 5.4
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.4 L / 327 )

    1972-1973 DODGE POLARA

    • CC: 6556
    • Liter: 6.6
    • SubModel: CUSTOM
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1956-1957 PLYMOUTH SUBURBAN

    • Liter: 4.5
    • SubModel: CUSTOM
    • CUI: 273
    • EngineType: V8 ( 4.5 L / 273 )

    1956 PLYMOUTH FURY

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1971 OLDSMOBILE CUTLASS

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1967 PONTIAC CATALINA

    • Liter: 7.0
    • SubModel: SAFARI
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1959 PLYMOUTH BELVEDERE

    • CC: 5917
    • Liter: 5.9
    • SubModel: BASE
    • CUI: 361
    • EngineType: V8 ( 5.9 L / 361 )

    1966 CHRYSLER NEWPORT

    • CC: 7211
    • Liter: 7.2
    • SubModel: BASE
    • CUI: 440
    • EngineType: V8 ( 7.2 L / 440 )

    1955-1957 CHEVROLET BEL AIR

    • EngineType: ALL
    • SubModel: NOMAD

    1970 DODGE POLARA

    • CC: 7212
    • Liter: 7.2
    • SubModel: BASE
    • CUI: 440
    • EngineType: V8 ( 7.2 L / 440 )

    1964 CHEVROLET IMPALA

    • Liter: 4.6
    • SubModel: SS
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )

    1967 DODGE CORONET

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1972-1973 DODGE POLARA

    • CC: 7212
    • Liter: 7.2
    • SubModel: CUSTOM
    • CUI: 440
    • EngineType: V8 ( 7.2 L / 440 )

    1958 PLYMOUTH SUBURBAN

    • CC: 5737
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1970-1971 PONTIAC BONNEVILLE

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1970 DODGE CORONET

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1957 PLYMOUTH BELVEDERE

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1972-1974 OLDSMOBILE VISTA CRUISER

    • CC: 5737
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1955 PLYMOUTH SAVOY

    • Liter: 3.9
    • SubModel: BASE
    • CUI: 239
    • EngineType: V8 ( 3.9 L / 239 )

    1963-1964 DODGE 330

    • CC: 6981
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 426
    • EngineType: V8 ( 7.0 L / 426 )

    1957 PLYMOUTH PLAZA

    • Liter: 4.9
    • SubModel: BASE
    • CUI: 299
    • EngineType: V8 ( 4.9 L / 299 )

    1974 DODGE W100 PICKUP

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1960 PONTIAC VENTURA

    • EngineType: ALL
    • SubModel: ALL

    1971 CHRYSLER NEWPORT

    • Liter: 6.3
    • SubModel: ROYAL
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1963 BUICK WILDCAT

    • EngineType: ALL
    • SubModel: ALL

    1970 PONTIAC TEMPEST

    • CC: 6555
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1967-1968 DODGE CHARGER

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1976 OLDSMOBILE CUSTOM CRUISER

    • EngineType: ALL
    • SubModel: ALL

    1968-1971 PONTIAC LEMANS

    • CC: 5733
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1971 DODGE B200 VAN

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1968 CHEVROLET EL CAMINO

    • CC: 5031
    • Liter: 5.0
    • SubModel: CUSTOM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1958 PLYMOUTH PLAZA

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1960-1961 DODGE POLARA

    • Liter: 5.9
    • SubModel: BASE
    • CUI: 361
    • EngineType: V8 ( 5.9 L / 361 )

    1967 DODGE W300 PICKUP

    • Liter: 5.2
    • SubModel: BASE
    • CUI: 318
    • EngineType: V8 ( 5.2 L / 318 )

    1968-1969 DODGE W300 PICKUP

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1960 CHEVROLET BISCAYNE

    • Liter: 4.6
    • SubModel: FLEETMASTER
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )

    1956-1957 PLYMOUTH PLAZA

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1974 DODGE B200 VAN

    • CC: 6555
    • Liter: 6.6
    • SubModel: SPORTSMAN
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1959 DODGE CUSTOM

    • Liter: 5.3
    • SubModel: BASE
    • CUI: 326
    • EngineType: V8 ( 5.3 L / 326 )

    1970 PONTIAC EXECUTIVE

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1970-1971 PONTIAC FIREBIRD

    • CC: 5733
    • Liter: 5.7
    • SubModel: ESPRIT
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1967 CHEVROLET CHEVELLE

    • Liter: 4.6
    • SubModel: CONCOURS
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )

    1971 PONTIAC LEMANS

    • CC: 6555
    • Liter: 6.6
    • SubModel: T37
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1955 DODGE CUSTOM

    • EngineType: ALL
    • SubModel: ALL

    1971 DODGE D100 PICKUP

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1971 PONTIAC FIREBIRD

    • EngineType: ALL
    • SubModel: FORMULA

    1971 PONTIAC CATALINA

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1971 PONTIAC GRAND SAFARI

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1969 OLDSMOBILE F85

    • CC: 5737
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1967 DODGE W300 SERIES

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1956 PLYMOUTH PLAZA

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 270
    • EngineType: V8 ( 4.4 L / 270 )

    1969 DODGE CORONET

    • Liter: 6.3
    • SubModel: 440
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1958 PLYMOUTH SUBURBAN

    • Liter: 5.7
    • SubModel: SPORT
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1965-1966 PLYMOUTH SATELLITE

    • Liter: 5.2
    • SubModel: BASE
    • CUI: 318
    • EngineType: V8 ( 5.2 L / 318 )

    1970 DODGE POLARA

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1963 PLYMOUTH SAVOY

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1968-1971 CHRYSLER NEWPORT

    • CC: 6286
    • Liter: 6.3
    • SubModel: CUSTOM
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1958-1959 DODGE CUSTOM

    • CC: 5917
    • Liter: 5.9
    • SubModel: BASE
    • CUI: 361
    • EngineType: V8 ( 5.9 L / 361 )

    1962 CHRYSLER NEWPORT

    • Liter: 6.8
    • SubModel: BASE
    • CUI: 413
    • EngineType: V8 ( 6.8 L / 413 )

    1957 PLYMOUTH BELVEDERE

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1970-1973 OLDSMOBILE 98

    • EngineType: ALL
    • SubModel: ALL

    1967 CHEVROLET CHEVELLE

    • Liter: 5.4
    • SubModel: DELUXE
    • CUI: 327
    • EngineType: V8 ( 5.4 L / 327 )

    1956-1957 PLYMOUTH SUBURBAN

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1975 CHRYSLER TOWN & COUNTRY

    • CC: 6555
    • Liter: 6.6
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: M
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1970 DODGE CORONET

    • CC: 7211
    • Liter: 7.2
    • SubModel: DELUXE
    • CUI: 440
    • EngineType: V8 ( 7.2 L / 440 )

    1966-1969 CHEVROLET CAPRICE

    • Liter: 5.4
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.4 L / 327 )

    1977-1978 DODGE MONACO

    • Liter: 6.6
    • SubModel: CRESTWOOD
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1972-1974 DODGE D100 PICKUP

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1956-1957 PLYMOUTH SUBURBAN

    • CC: 4540
    • Liter: 4.5
    • SubModel: BASE
    • CUI: 277
    • EngineType: V8 ( 4.5 L / 277 )

    1967 DODGE D200 SERIES

    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1970 DODGE CORONET

    • CC: 6286
    • Liter: 6.3
    • SubModel: SUPER BEE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1956 DODGE CUSTOM

    • Liter: 4.4
    • SubModel: BASE
    • CUI: 270
    • EngineType: V8 ( 4.4 L / 270 )

    1968 CHEVROLET CHEVELLE

    • CC: 5031
    • Liter: 5.0
    • SubModel: MALIBU
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1971 PONTIAC CATALINA

    • CC: 7456
    • Liter: 7.5
    • SubModel: SAFARI
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1954 CHEVROLET BEL AIR

    • EngineType: ALL
    • SubModel: ALL

    1965 BUICK LESABRE

    • EngineType: ALL
    • SubModel: ALL

    1967-1971 CHRYSLER NEWPORT

    • CC: 6286
    • Liter: 6.3
    • SubModel: BASE
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1963-1966 PLYMOUTH FURY

    • Liter: 6.3
    • SubModel: SPORT
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1970 OLDSMOBILE DELTA 88

    • CC: 5737
    • Liter: 5.7
    • SubModel: ROYALE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1976 DODGE CHARGER

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1964-1967 CHEVROLET CHEVELLE

    • CC: 4638
    • Liter: 4.6
    • SubModel: SS
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )

    1970-1971 OLDSMOBILE DELTA 88

    • CC: 7456
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1971 DODGE D200 PICKUP

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1962 CHEVROLET IMPALA

    • Liter: 5.4
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.4 L / 327 )

    1967 CHEVROLET CAMARO

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.3 L / 327 )

    1965 BUICK WILDCAT

    • CC: 6572
    • Liter: 6.6
    • SubModel: DELUXE
    • CUI: 401
    • EngineType: V8 ( 6.6 L / 401 )

    1964-1967 CHEVROLET CHEVY II

    • CC: 4638
    • Liter: 4.6
    • SubModel: NOVA SS
    • CUI: 283
    • EngineType: V8 ( 4.6 L / 283 )
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