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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

    1968-1971 OLDSMOBILE VISTA CRUISER

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

    1975-1976 DODGE CORONET

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

    1970 PONTIAC FIREBIRD

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

    1971 DODGE POLARA

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

    1969-1971 OLDSMOBILE CUTLASS

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

    1958 DODGE CUSTOM

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

    1961-1963 CHRYSLER TOWN & COUNTRY

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

    1962 CHRYSLER NEWPORT

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

    1971 DODGE D200 PICKUP

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

    1966 DODGE POLARA

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

    1970 OLDSMOBILE CUTLASS

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

    1966-1967 BUICK SPORTWAGON

    • CC: 5573
    • Liter: 5.6
    • SubModel: BASE
    • CUI: 340
    • EngineType: V8 ( 5.6 L / 340 )

    1971 DODGE W100 PICKUP

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

    1956 DODGE CORONET

    • CC: 5163
    • Liter: 5.1
    • SubModel: BASE
    • CUI: 315
    • EngineType: V8 ( 5.1 L / 315 )

    1969 OLDSMOBILE DELTA 88

    • EngineType: ALL
    • SubModel: ROYALE

    1959-1965 CHRYSLER IMPERIAL

    • EngineType: ALL
    • SubModel: CROWN

    1955 PLYMOUTH PLAZA

    • CC: 4261
    • Liter: 4.3
    • SubModel: BASE
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1972-1973 DODGE POLARA

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

    1967 DODGE D300 PICKUP

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

    1956 PLYMOUTH FURY

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

    1967 DODGE CORONET

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

    1968-1970 OLDSMOBILE DELTA 88

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

    1974 DODGE B200 VAN

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

    1968 OLDSMOBILE CUTLASS

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

    1959 CHEVROLET BEL AIR

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

    1968 CHEVROLET BEL AIR

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

    1967 DODGE W200 PICKUP

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

    1972 CHRYSLER NEWPORT

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

    1957 PLYMOUTH SUBURBAN

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

    1972-1974 DODGE D300 PICKUP

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

    1967 DODGE CHARGER

    • CC: 5212
    • Liter: 5.2
    • SubModel: BASE
    • CUI: 318
    • EngineType: V8 ( 5.2 L / 318 )

    1975 OLDSMOBILE CUSTOM CRUISER

    • Liter: 7.5
    • SubModel: PANEL
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1971 PONTIAC FIREBIRD

    • EngineType: ALL
    • SubModel: FORMULA

    1956 PLYMOUTH SUBURBAN

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

    1968-1969 DODGE W300 PICKUP

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

    1968 CHEVROLET CHEVELLE

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

    1969 OLDSMOBILE VISTA CRUISER

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

    1971 DODGE POLARA

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

    1971 PONTIAC CATALINA

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

    1961-1962 CHEVROLET BEL AIR

    • Liter: 3.8
    • SubModel: BASE
    • CUI: 235
    • EngineType: L6 ( 3.8 L / 235 )

    1970 DODGE CORONET

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

    1967-1969 CHRYSLER NEWPORT

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

    1971 OLDSMOBILE CUTLASS

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

    1977-1978 DODGE MONACO

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

    1956-1957 PLYMOUTH BELVEDERE

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

    1969-1970 JEEP DJ5A

    • CC: 3687
    • Liter: 3.7
    • SubModel: BASE
    • CUI: 225
    • EngineType: V6 ( 3.7 L / 225 )

    1966 CHRYSLER NEWPORT

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

    1955-1956 CHEVROLET BEL AIR

    • CC: 4343
    • Liter: 4.3
    • SubModel: BEAUVILLE
    • CUI: 265
    • EngineType: V8 ( 4.3 L / 265 )

    1959 BUICK LESABRE

    • CC: 5967
    • Liter: 6.0
    • SubModel: BASE
    • CUI: 364
    • EngineType: V8 ( 6.0 L / 364 )

    1970 DODGE CORONET

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

    1968-1969 DODGE D100 PICKUP

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

    1963-1964 DODGE 330

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

    1972 CHRYSLER NEW YORKER

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

    1972-1974 DODGE CORONET

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

    1970-1971 PONTIAC FIREBIRD

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

    1971 CHRYSLER NEWPORT

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

    1968-1969 CHRYSLER NEWPORT

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

    1964 BUICK LESABRE

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

    1970 PONTIAC EXECUTIVE

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

    1960-1961 DODGE CUSTOM

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

    1954 DODGE CUSTOM

    • CC: 3957
    • Liter: 4.0
    • SubModel: BASE
    • CUI: 241
    • EngineType: V8 ( 4.0 L / 241 )

    1970 DODGE CORONET

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

    1970 DODGE CORONET

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

    1968 PONTIAC TEMPEST

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

    1958 PLYMOUTH BELVEDERE

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

    1951-1953 BUICK SPECIAL

    • Liter: 4.3
    • SubModel: BASE
    • CUI: 263
    • EngineType: L8 ( 4.3 L / 263 )

    1976-1977 CHRYSLER TOWN & COUNTRY

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

    1968-1969 DODGE D200 PICKUP

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

    1962-1965 DODGE POLARA

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

    1958 PLYMOUTH SAVOY

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

    1969 DODGE MONACO

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

    1970-1971 DODGE D200 PICKUP

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

    1965-1967 BUICK SKYLARK

    • CC: 4917
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 300
    • EngineType: V8 ( 4.9 L / 300 )

    1966-1967 CHEVROLET CAPRICE

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

    1972-1974 OLDSMOBILE CUTLASS SUPREME

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

    1974 DODGE MONACO

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

    1958 CHEVROLET BEL AIR

    • Liter: 3.8
    • SubModel: BASE
    • CUI: 235
    • EngineType: L6 ( 3.8 L / 235 )

    1965-1968 PLYMOUTH SATELLITE

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

    1975-1978 CHRYSLER NEWPORT

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

    1968 DODGE CHARGER

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

    1968-1969 PONTIAC FIREBIRD

    • EngineType: ALL
    • SubModel: 350

    1956 PLYMOUTH SUBURBAN

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

    1967 CHEVROLET CHEVELLE

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

    1957 DODGE CORONET

    • CC: 5802
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 354
    • EngineType: V8 ( 5.8 L / 354 )

    1970 PONTIAC FIREBIRD

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

    1956-1957 PLYMOUTH SUBURBAN

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

    1962 BUICK SPECIAL

    • Liter: 3.2
    • SubModel: BASE
    • CUI: 198
    • EngineType: V6 ( 3.2 L / 198 )

    1969 DODGE CORONET

    • Liter: 6.3
    • SubModel: 500
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1972-1974 OLDSMOBILE VISTA CRUISER

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

    1959 CHEVROLET BEL AIR

    • CC: 3852
    • Liter: 3.8
    • SubModel: BASE
    • CUI: 235
    • EngineType: L6 ( 3.8 L / 235 )

    1969 PONTIAC CATALINA

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

    1955 BUICK SPECIAL

    • CC: 4343
    • Liter: 4.3
    • SubModel: BASE
    • CUI: 264
    • EngineType: V8 ( 4.3 L / 264 )

    1959 PLYMOUTH CUSTOM

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

    1971 PONTIAC LEMANS

    • CC: 5733
    • Liter: 5.7
    • SubModel: T37
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1953-1958 BUICK ROADMASTER

    • EngineType: ALL
    • SubModel: ALL

    1963 BUICK WILDCAT

    • EngineType: ALL
    • SubModel: ALL

    1963 BUICK SPECIAL

    • CC: 3245
    • Liter: 3.2
    • SubModel: DELUXE
    • CUI: 198
    • EngineType: V6 ( 3.2 L / 198 )

    1967 CADILLAC FLEETWOOD

    • EngineType: ALL
    • SubModel: ALL

    1959-1960 PONTIAC CATALINA

    • EngineType: ALL
    • SubModel: ALL

    1968 CHEVROLET IMPALA

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