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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 $1.69
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

    1965 BUICK WILDCAT

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

    1970-1971 PONTIAC GTO

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

    1967 DODGE MONACO

    • EngineType: ALL
    • SubModel: 500

    1970 PONTIAC EXECUTIVE

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

    1962-1965 PLYMOUTH FURY

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

    1955 PLYMOUTH PLAZA

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

    1971 DODGE POLARA

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

    1967 CHEVROLET CAMARO

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

    1956-1957 PLYMOUTH SAVOY

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

    1958 CHEVROLET BISCAYNE

    • EngineType: ALL
    • SubModel: ALL

    1955 PLYMOUTH PLAZA

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

    1963 BUICK SPECIAL

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

    1972-1974 DODGE CORONET

    • CC: 6556
    • Liter: 6.6
    • SubModel: CRESTWOOD
    • 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 )

    1966-1971 JEEP CJ6

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

    1967 CHRYSLER TOWN & COUNTRY

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

    1962-1967 CHEVROLET BEL AIR

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

    1956 PLYMOUTH SAVOY

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

    1970-1971 PONTIAC FIREBIRD

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

    1970 DODGE CORONET

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

    1970 PONTIAC EXECUTIVE

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

    1958 BUICK LIMITED

    • EngineType: ALL
    • SubModel: ALL

    1966-1967 BUICK SPORTWAGON

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

    1963-1965 DODGE 880

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

    1967-1969 PONTIAC CATALINA

    • CC: 7014
    • Liter: 7.0
    • SubModel: VENTURA
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1977-1978 DODGE MONACO

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

    1968 CHEVROLET CHEVELLE

    • EngineType: ALL
    • SubModel: BASE

    1956 PLYMOUTH FURY

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

    1970-1971 PONTIAC LEMANS

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

    1971 OLDSMOBILE CUTLASS

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

    1963-1964 DODGE 440

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

    1966-1968 JEEP DJ6

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

    1966 CHEVROLET CHEVELLE

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

    1965 BUICK LESABRE

    • EngineType: ALL
    • SubModel: ALL

    1970-1971 CHRYSLER NEWPORT

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

    1956 PLYMOUTH BELVEDERE

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

    1975-1976 DODGE CORONET

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

    1971 DODGE POLARA

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

    1976-1977 CHRYSLER TOWN & COUNTRY

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

    1958 PLYMOUTH SAVOY

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

    1964-1967 PONTIAC TEMPEST

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

    1966-1969 JEEP JEEPSTER

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

    1957 PLYMOUTH SUBURBAN

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

    1975-1976 DODGE MONACO

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

    1968-1971 OLDSMOBILE F85

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

    1967-1971 CHRYSLER NEWPORT

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

    1975-1978 DODGE MONACO

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

    1975-1976 CHRYSLER NEW YORKER

    • EngineType: ALL
    • SubModel: ALL

    1962-1967 CHEVROLET BISCAYNE

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

    1963-1966 PONTIAC STAR CHIEF

    • EngineType: ALL
    • SubModel: ALL

    1971 DODGE W100 PICKUP

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

    1955 PLYMOUTH SUBURBAN

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

    1957 PLYMOUTH SUBURBAN

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

    1971 PONTIAC CATALINA

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

    1970-1971 PONTIAC BONNEVILLE

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

    1960-1966 PLYMOUTH BELVEDERE

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

    1968 DODGE CORONET

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

    1967-1968 PONTIAC GRAND PRIX

    • CC: 7014
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1971 DODGE CHARGER

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

    1971 PONTIAC FIREBIRD

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

    1961-1966 PLYMOUTH FURY

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

    1961 PONTIAC VENTURA

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

    1969 DODGE CHARGER

    • Liter: 6.3
    • SubModel: SE
    • 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 )

    1971 PONTIAC FIREBIRD

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

    1975-1978 CHRYSLER NEWPORT

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

    1971 PONTIAC CATALINA

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

    1969-1970 JEEP DJ5A

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

    1970-1971 DODGE CHALLENGER

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

    1956-1957 PLYMOUTH SUBURBAN

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

    1966-1971 JEEP CJ5

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

    1974 DODGE B200 VAN

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

    1965 BUICK WILDCAT

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

    1965 BUICK SPORTWAGON

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

    1972-1974 DODGE CHARGER

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

    1958 DODGE CUSTOM

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

    1962 DODGE 880

    • EngineType: ALL
    • SubModel: ALL

    1961-1966 PLYMOUTH BELVEDERE

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

    1970 DODGE POLARA

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

    1966 JEEP FC150

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

    1971 PONTIAC GRANDVILLE

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

    1965-1967 CHEVROLET CHEVELLE

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

    1967-1968 DODGE POLARA

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

    1957-1958 BUICK SPECIAL

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

    1967 DODGE D200 SERIES

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

    1975-1976 DODGE CORONET

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

    1970 PONTIAC BONNEVILLE

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

    1968 PONTIAC TEMPEST

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

    1964-1967 CHEVROLET CHEVELLE

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

    1965 BUICK GRAN SPORT

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

    1968-1971 PONTIAC FIREBIRD

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

    1957 PLYMOUTH SUBURBAN

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

    1961-1963 CHRYSLER TOWN & COUNTRY

    • CC: 6769
    • Liter: 6.7
    • SubModel: BASE
    • CUI: 413
    • EngineType: V8 ( 6.7 L / 413 )

    1958 PLYMOUTH SUBURBAN

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

    1972-1974 DODGE CORONET

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

    1972-1974 OLDSMOBILE CUTLASS

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

    1961-1962 CHEVROLET BEL AIR

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

    1969 OLDSMOBILE VISTA CRUISER

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

    1968-1969 CHEVROLET BEL AIR

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

    1956 DODGE CUSTOM

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