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NGK Spark Plugs XR4

V-Power Resistor Spark Plug 14mm x 3/8" Reach

NGK Spark Plugs XR4

739-XR4

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NGK Spark Plugs XR4 V-Power Resistor Spark Plug 14mm x 3/8" Reach $1.99
V-Power Resistor Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat

  • Specifications:

    Manufacturer's Part Number:
    XR4

    Modern, lean-burning, fuel-efficient engines call for new lower sparking voltage requirements. NGK Spark Plugs responded by developing V-Power Spark Plugs with V-groove center electrodes. The V-groove center electrode forces the spark to the ground electrode's outer edge, placing the spark closer to the air/fuel mixture to ignite it quicker for more complete combustion (thus greater power & less harmful emissions).

    Today's performance engines are often high-compression/high-stress: supercharged, turbocharged, or fed by nitrous oxide. Ideal for high-performance street and race cars, NGK's patented V-groove design allows an ignition system to spark easily in such dense air/fuel mixtures. The flame kernel grows rapidly and enables an engine to potentially make more power because it's operating more efficiently. As a bonus, the spark's outer edge location helps limit the quenching effect, reducing misfires caused by high cylinder pressures "blowing out" the spark. V-Power Spark Plugs also use lower ignition firing voltage, which results in faster starts and easier cold starts throughout the life of the plugs. Sold individually.

    Does NGK Spark Plugs XR4 fit your vehicle?

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    Aspiration

    1957 PLYMOUTH SAVOY

    • CC: 4933
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1968 CHEVROLET CHEVELLE

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

    1956 PLYMOUTH FURY

    • Liter: 4.5
    • SubModel: BASE
    • CUI: 270
    • EngineType: V8 ( 4.5 L / 270 )

    1966-1967 CHEVROLET IMPALA

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

    1970-1971 DODGE CHARGER

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

    1963-1964 DODGE 880

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

    1956 PLYMOUTH SUBURBAN

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

    1969 DODGE W200 PICKUP

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

    1967 DODGE W200 PICKUP

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

    1972-1973 DODGE POLARA

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

    1960-1961 PLYMOUTH CUSTOM

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

    1971 PONTIAC GRAND SAFARI

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

    1969-1970 PONTIAC LEMANS

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

    1968-1969 DODGE W100 PICKUP

    • 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 )

    1955 DODGE CORONET

    • CC: 4425
    • Liter: 4.4
    • SubModel: BASE
    • CUI: 270
    • EngineType: V8 ( 4.4 L / 270 )

    1967-1969 CHRYSLER NEWPORT

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

    1969 PONTIAC BONNEVILLE

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

    1959-1960 CHRYSLER TOWN & COUNTRY

    • EngineType: ALL
    • SubModel: ALL

    1966 PLYMOUTH BELVEDERE

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

    1971 DODGE B200 VAN

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

    1973-1974 CHRYSLER NEWPORT

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

    1968-1969 CHRYSLER 300

    • EngineType: ALL
    • SubModel: ALL

    1954 BUICK SPECIAL

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

    1970 PONTIAC EXECUTIVE

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

    1968 CHEVROLET EL CAMINO

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

    1970-1971 OLDSMOBILE 442

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

    1950-1953 CHEVROLET BEL AIR

    • Liter: 3.9
    • SubModel: BASE
    • CUI: 236
    • EngineType: L6 ( 3.9 L / 236 )

    1963-1967 CHEVROLET CHEVY II

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

    1964 PLYMOUTH SAVOY

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

    1972-1974 CHRYSLER NEWPORT

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

    1967-1968 DODGE POLARA

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

    1974 DODGE W100 PICKUP

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

    1963 DODGE POLARA

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

    1966 OLDSMOBILE F85

    • CC: 5409
    • Liter: 5.4
    • SubModel: HOLIDAY
    • CUI: 330
    • EngineType: V8 ( 5.4 L / 330 )

    1970 PONTIAC TEMPEST

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

    1953-1958 BUICK ROADMASTER

    • EngineType: ALL
    • SubModel: ALL

    1957 PLYMOUTH FURY

    • CC: 4933
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1959 CHEVROLET IMPALA

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

    1971 DODGE MONACO

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

    1970-1971 PONTIAC FIREBIRD

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

    1968 DODGE CORONET

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

    1958-1959 PLYMOUTH BELVEDERE

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

    1975-1976 DODGE CHARGER

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

    1974 OLDSMOBILE CUTLASS SUPREME

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

    1970 PONTIAC LEMANS

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

    1975-1976 DODGE MONACO

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

    1975-1978 CHRYSLER NEWPORT

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

    1961 PONTIAC VENTURA

    • CC: 6376
    • Liter: 6.4
    • SubModel: BASE
    • CUI: 389
    • EngineType: V8 ( 6.4 L / 389 )

    1970 OLDSMOBILE F85

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

    1971 DODGE CHARGER

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

    1956-1957 PLYMOUTH PLAZA

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

    1966-1967 CHEVROLET IMPALA

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

    1971 DODGE CORONET

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

    1972 OLDSMOBILE F85

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

    1957 PLYMOUTH SAVOY

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

    1956 PLYMOUTH PLAZA

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

    1974 DODGE MONACO

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

    1957-1958 CHEVROLET BEL AIR

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

    1970 OLDSMOBILE DELTA 88

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

    1957-1958 DODGE CORONET

    • CC: 5327
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 325
    • EngineType: V8 ( 5.3 L / 325 )

    1971 DODGE CORONET

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

    1971 DODGE W300 PICKUP

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

    1956 DODGE CUSTOM

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

    1972-1973 DODGE POLARA

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

    1955 PLYMOUTH SAVOY

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

    1966 CHEVROLET CHEVELLE

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

    1962-1969 CHEVROLET BEL AIR

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

    1975-1978 DODGE MONACO

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

    1963-1964 DODGE 330

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

    1975 CHRYSLER TOWN & COUNTRY

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

    1968-1969 PONTIAC FIREBIRD

    • EngineType: ALL
    • SubModel: 350

    1963-1965 PLYMOUTH BELVEDERE

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

    1966-1971 JEEP CJ6

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

    1955-1957 CHEVROLET BEL AIR

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

    1967 DODGE CORONET

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

    1968-1969 DODGE W300 PICKUP

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

    1954 BUICK SKYLARK

    • Liter: 5.3
    • SubModel: BASE
    • CUI: 322
    • EngineType: V8 ( 5.3 L / 322 )

    1967 PONTIAC BONNEVILLE

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

    1963 BUICK SPECIAL

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

    1972-1974 DODGE CHARGER

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

    1958 PLYMOUTH BELVEDERE

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

    1969 DODGE POLARA

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

    1958 PLYMOUTH CUSTOM

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

    1959-1965 CHRYSLER IMPERIAL

    • EngineType: ALL
    • SubModel: LEBARON

    1968-1971 OLDSMOBILE VISTA CRUISER

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

    1956-1957 PLYMOUTH PLAZA

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

    1957 PLYMOUTH BELVEDERE

    • CC: 4933
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1957 PLYMOUTH SAVOY

    • CC: 4933
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1967 CHEVROLET CAMARO

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

    1955 PLYMOUTH BELVEDERE

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

    1962 PONTIAC CATALINA

    • CC: 6376
    • Liter: 6.4
    • SubModel: VENTURA
    • CUI: 389
    • EngineType: V8 ( 6.4 L / 389 )

    1971 OLDSMOBILE DELTA 88

    • EngineType: ALL
    • SubModel: ROYALE

    1970 DODGE CORONET

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

    1963-1967 PONTIAC LEMANS

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

    1958-1959 PLYMOUTH CUSTOM

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

    1969-1971 DODGE CHARGER

    • CC: 6286
    • Liter: 6.3
    • SubModel: 500
    • CUI: 383
    • EngineType: V8 ( 6.3 L / 383 )

    1974 OLDSMOBILE OMEGA

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

    1970-1971 DODGE D300 PICKUP

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

    1972-1973 DODGE POLARA

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