Denso 4PR-U Resistor U-Groove Spark Plug

DENSO's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.

Even DENSO's "standard" spark plug is something special. The innovative design that helped to make DENSO spark plugs famous, the U-groove plug employs a unique, channeled ground electrode designed to generate a larger spark nucleus at the point of ignition. Greater spark energy than ordinary plugs means improved flame travel, producing more complete, consistent, and efficient combustion.

Vehicle Fitments:

Year	Make	Model	Submodel
1973 - 1975	Buick	Apollo	Base
1975	Buick	Apollo	SR
1978	Buick	Century	Special, Custom, Limited, Sport
1977 - 1979	Buick	LeSabre	Base
1977 - 1978	Buick	LeSabre	Custom
1977	Buick	LeSabre	Custom Sport
1979	Buick	LeSabre	Limited
1978 - 1979	Buick	LeSabre	Sport
1977 - 1978	Buick	Regal	Base
1978	Buick	Regal	Sport, Limited
1977	Buick	Regal	SR
1977 - 1978	Buick	Skyhawk	Base, S
1970	Buick	Skylark	350
1970 - 1978	Buick	Skylark	Custom, Base
1977 - 1978	Buick	Skylark	S
1978	Buick	Skylark	Sport
1977	Buick	Skylark	SR
1976 - 1979	Checker	Marathon	Deluxe, Base
1971	Chevrolet	Bel Air	Base
1971	Chevrolet	Biscayne	Base
1970 - 1971	Chevrolet	Blazer	Base
1978 - 1980	Chevrolet	C10	Big Ten
1976 - 1980	Chevrolet	C10	Silverado, Custom Deluxe, Custom, Cheyenne, Scottsdale
1971	Chevrolet	C10 Pickup	Base
1971 - 1972	Chevrolet	C10 Suburban	Base
1976 - 1980	Chevrolet	C10 Suburban	Custom Deluxe, Scottsdale, Silverado
1976 - 1980	Chevrolet	C20	Cheyenne, Scottsdale, Custom Deluxe, Silverado
1971 - 1972	Chevrolet	C20 Pickup	Base
1971	Chevrolet	C20 Suburban	Base
1978 - 1980	Chevrolet	C30	Cheyenne, Silverado, Base, Custom Deluxe, Scottsdale
1971	Chevrolet	C30 Pickup	Base
1979	Chevrolet	Camaro	Berlinetta
1976 - 1978	Chevrolet	Camaro	LT Rally Sport, LT
1976 - 1979	Chevrolet	Camaro	Rally Sport
1971	Chevrolet	Camaro	SS, RS
1971 - 1979	Chevrolet	Camaro	Z28, Base
1977 - 1978	Chevrolet	Caprice	Classic Estate
1977 - 1979	Chevrolet	Caprice	Classic, Classic Landau
1979	Chevrolet	Caprice	Landau, Classic Sport
1971	Chevrolet	Chevelle	Malibu, Greenbrier, Concours, Concours Estate, Nomad, Base, SS
1970 - 1977	Chevrolet	El Camino	Base, SS
1975 - 1977	Chevrolet	El Camino	Classic
1977	Chevrolet	El Camino	Conquista
1970 - 1972	Chevrolet	El Camino	Custom
1976 - 1979	Chevrolet	G10	Chevy Van, Sportvan, Beauville
1971	Chevrolet	G10 Van	Base, Sportvan
1977 - 1980	Chevrolet	G20	Beauville, Sportvan, Chevy Van
1978 - 1980	Chevrolet	G20	Nomad
1970 - 1971	Chevrolet	G20 Van	Base, Sportvan
1976 - 1979	Chevrolet	G30	Beauville, Chevy Van, Sportvan, Hi-Cube
1971	Chevrolet	G30 Van	Sportvan, Base
1971 - 1979	Chevrolet	Impala	Base
1977	Chevrolet	Impala	Custom
1977 - 1979	Chevrolet	Impala	Landau
1979	Chevrolet	Impala	Sport
1976 - 1980	Chevrolet	K10	Custom Deluxe, Cheyenne, Silverado, Scottsdale
1970 - 1972	Chevrolet	K10 Pickup	Base
1970 - 1972	Chevrolet	K10 Suburban	Base
1976 - 1980	Chevrolet	K10 Suburban	Custom Deluxe, Silverado, Scottsdale
1976 - 1980	Chevrolet	K20	Custom Deluxe, Cheyenne, Silverado, Scottsdale
1971	Chevrolet	K20 Pickup	Base
1970 - 1972	Chevrolet	K20 Suburban	Base
1971	Chevrolet	K30 Pickup	Base
1976	Chevrolet	K5 Blazer	Base
1976 - 1980	Chevrolet	K5 Blazer	Cheyenne
1977 - 1980	Chevrolet	K5 Blazer	Custom Deluxe
1978 - 1980	Chevrolet	K5 Blazer	Silverado
1977	Chevrolet	Malibu	Classic Sport, Sport
1976 - 1977	Chevrolet	Malibu	Classic, Base, Classic Landau
1976	Chevrolet	Malibu	Landau, Classic Estate
1971 - 1979	Chevrolet	Nova	Base
1976 - 1977	Chevrolet	Nova	Concours
1978 - 1979	Chevrolet	Nova	Custom
1976 - 1978	Chevrolet	Nova	Police
1977 - 1979	Chevrolet	Nova	Rally
1976	Chevrolet	Nova	SS
1970 - 1972	Chevrolet	P10 Van	Base
1970 - 1971	Chevrolet	P20 Van	Base
1976 - 1979	Chevrolet	P30	Step-Van, Base
1971	Chevrolet	P30 Van	Base
1980	Chrysler	Cordoba	300, Crown
1980 - 1983	Chrysler	Cordoba	Base
1980 - 1982	Chrysler	Cordoba	LS
1983	Chrysler	Fifth Avenue	Base
1978 - 1981	Chrysler	LeBaron	Medallion, Base
1978	Chrysler	LeBaron	S
1979 - 1981	Chrysler	LeBaron	Salon
1980 - 1981	Chrysler	LeBaron	Special
1981	Chrysler	LeBaron	Town & Country
1982	Chrysler	New Yorker	Base
1979 - 1981	Chrysler	Newport	Base
1978 - 1981	Chrysler	Town & Country	Base
1976 - 1980	Dodge	Aspen	Base
1976 - 1977	Dodge	Aspen	Special Edition, Custom
1978 - 1980	Dodge	B100	Base
1981 - 1984	Dodge	B150	Base
1978 - 1980	Dodge	B200	Base
1981 - 1984	Dodge	B250	Base
1978 - 1980	Dodge	B300	Base
1978 - 1979	Dodge	CB300	Base
1976	Dodge	Charger	Special Edition, Sport, Base
1975 - 1976	Dodge	Coronet	Brougham, Crestwood, Base
1975	Dodge	Coronet	Custom
1978 - 1979	Dodge	D100	Adventurer, Custom, Base, Club Cab
1979	Dodge	D100	Estacas, Warlock II
1978	Dodge	D100	Warlock
1982 - 1984	Dodge	D150	Adventurer, Estacas
1978 - 1984	Dodge	D150	Base
1981 - 1984	Dodge	D150	Club Cab
1978 - 1979	Dodge	D150	Li'l Red Express
1982 - 1983	Dodge	D150	Miser
1982	Dodge	D150	RAM, Equipado
1978 - 1980	Dodge	D200	Base
1981 - 1984	Dodge	D250	Base
1977 - 1978	Dodge	D300	RD, Base
1977	Dodge	D300	RS
1976	Dodge	Dart	360
1975	Dodge	Dart	Custom, Sport 360, Special Edition
1975 - 1976	Dodge	Dart	Swinger, Sport, Swinger Special, Base
1978 - 1981	Dodge	Diplomat	Base
1978 - 1983	Dodge	Diplomat	Medallion
1978	Dodge	Diplomat	S
1979 - 1983	Dodge	Diplomat	Salon
1981	Dodge	Diplomat	Sport
1981 - 1983	Dodge	Mirada	Base
1980 - 1983	Dodge	Mirada	Special Coupe
1977 - 1978	Dodge	Monaco	Brougham, Crestwood, Base
1978 - 1980	Dodge	Ramcharger	Base, SE
1979 - 1981	Dodge	St. Regis	Base
1978 - 1984	Dodge	W150	Base
1978 - 1980	Dodge	W200	Base
1978	Dodge	W300	Base
1985	Ford	Thunderbird	Elan, LX, Base, Sport, Equipado, Fila, Turbo
1977 - 1978	GMC	C15	Heavy Half, Sierra Classic, Base, High Sierra, Sierra Grande
1977	GMC	C15	Indy Hauler
1978	GMC	C15	Street Coupe
1976 - 1978	GMC	C15 Suburban	High Sierra, Sierra Grande, Sierra Classic, Base
1971	GMC	C15/C1500 Pickup	Base
1971	GMC	C15/C1500 Suburban	Base
1979 - 1980	GMC	C1500	High Sierra, Heavy Half, Base, Sierra Classic, Sierra Grande, Street Coupe
1979 - 1980	GMC	C1500 Suburban	Sierra Classic, High Sierra, Sierra Grande, Base
1977 - 1978	GMC	C25	High Sierra, Sierra Classic, Sierra Grande, Base
1971	GMC	C25/C2500 Pickup	Base
1971	GMC	C25/C2500 Suburban	Base
1979 - 1980	GMC	C2500	Sierra Grande, Sierra Classic, High Sierra, Base
1978	GMC	C35	Base, Sierra Classic, Sierra Grande, High Sierra
1971	GMC	C35/C3500 Pickup	Base
1979 - 1980	GMC	C3500	High Sierra, Sierra Classic, Base, Sierra Grande
1976 - 1978	GMC	G15	Rally STX, Vandura, Rally
1971	GMC	G15/G1500 Van	Rally, Vandura, Base
1979 - 1980	GMC	G1500	Rally, Rally STX, Vandura
1978	GMC	G25	Rally, Rally STX, Vandura
1971	GMC	G25/G2500 Van	Base, Rally, Vandura
1979 - 1980	GMC	G2500	Vandura, Rally STX, Rally
1971	GMC	G35/G3500 Van	Rally, Vandura, Base
1979	GMC	G3500	Rally Camper Special, Rally, Vandura, Magnavan, Rally STX, Vandura Special
1971 - 1980	GMC	Jimmy	Base
1976 - 1980	GMC	Jimmy	Sierra Classic, High Sierra, Sierra Grande
1978 - 1980	GMC	Jimmy	Street Coupe
1977 - 1978	GMC	K15	Base, High Sierra, Sierra Grande, Sierra Classic
1977	GMC	K15	Indy Hauler
1976 - 1978	GMC	K15 Suburban	Sierra Grande, Sierra Classic, High Sierra, Base
1971	GMC	K15/K1500 Pickup	Base
1971	GMC	K15/K1500 Suburban	Base
1979	GMC	K1500	Sierra Classic, High Sierra, Sierra Grande, Base
1979 - 1980	GMC	K1500 Suburban	Sierra Grande, Base, High Sierra, Sierra Classic
1976 - 1978	GMC	K25	Sierra Classic, Base, Sierra Grande, High Sierra
1971	GMC	K25/K2500 Pickup	Base
1971	GMC	K25/K2500 Suburban	Base
1980	GMC	K2500	High Sierra, Base, Sierra Grande, Sierra Classic
1971	GMC	K35/K3500 Pickup	Base
1971	GMC	P15/P1500 Van	Base
1971	GMC	P35/P3500 Van	Base
1976 - 1977	GMC	Sprint	Classic, Base
1976	GMC	Sprint	SP, Sierra Madre Del Sur
1985	Lincoln	Continental	Valentino, Givenchy, Base
1985	Lincoln	Mark VII	Base, Versace, Bill Blass, LSC
1985	Lincoln	Town Car	Base, Signature, Cartier
1985	Mercury	Cougar	Base, LS, XR-7
1985	Mercury	Grand Marquis	LS, Colony Park, Base
1975 - 1977	Oldsmobile	Cutlass	442
1970 - 1975	Oldsmobile	Cutlass	Base
1977	Oldsmobile	Cutlass	Colonnade
1971 - 1977	Oldsmobile	Cutlass	S
1976 - 1977	Oldsmobile	Cutlass	Vista Cruiser, Colonnade S
1977	Oldsmobile	Cutlass Supreme	Brougham
1976 - 1977	Oldsmobile	Cutlass Supreme	Colonnade, Base
1979	Oldsmobile	Delta 88	Base, Royale
1970 - 1971	Oldsmobile	F85	Base
1973 - 1977	Oldsmobile	Omega	Base
1976 - 1977	Oldsmobile	Omega	Brougham, SX, F85
1977	Oldsmobile	Omega	Deluxe
1975	Oldsmobile	Omega	Salon
1983	Plymouth	Gran Fury	Base
1978 - 1980	Plymouth	PB100	Voyager
1981 - 1983	Plymouth	PB150	Voyager
1978 - 1980	Plymouth	PB200	Voyager
1981 - 1983	Plymouth	PB250	Voyager
1978 - 1980	Plymouth	Trailduster	Base
1974 - 1977	Pontiac	Bonneville	Base
1976 - 1977	Pontiac	Bonneville	Brougham
1972 - 1978	Pontiac	Catalina	Base, Safari
1972	Pontiac	Catalina	Brougham
1970 - 1978	Pontiac	Firebird	Trans Am, Base, Esprit, Formula
1973 - 1975	Pontiac	Grand Am	Base
1975 - 1978	Pontiac	Grand LeMans	Base, Safari
1976	Pontiac	Grand LeMans	BR
1976 - 1978	Pontiac	Grand LeMans	LE
1978	Pontiac	Grand LeMans	SA
1976 - 1978	Pontiac	Grand Prix	Base
1975 - 1978	Pontiac	Grand Prix	LJ, SJ
1975 - 1977	Pontiac	Grand Safari	Base
1975	Pontiac	Grandville	Brougham
1970 - 1978	Pontiac	LeMans	Base, Safari
1972 - 1974	Pontiac	LeMans	Luxury
1974	Pontiac	LeMans	Safari Luxury
1970 - 1977	Pontiac	LeMans	Sport
1976 - 1977	Pontiac	LeMans	Sport Coupe
1971	Pontiac	LeMans	T37
1977 - 1978	Pontiac	Phoenix	Base
1978	Pontiac	Phoenix	LJ, SJ
1976 - 1978	Pontiac	Sunbird	Base
1978	Pontiac	Sunbird	Safari
1976	Pontiac	Sunbird	SJ
1970	Pontiac	Tempest	Base, GT
1971 - 1977	Pontiac	Ventura	Base
1973 - 1975	Pontiac	Ventura	Custom
1974	Pontiac	Ventura	GTO
1975	Pontiac	Ventura	S
1975 - 1977	Pontiac	Ventura	SJ