Denso 16R-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
1985 - 1987	Buick	Regal	Base, Limited, Grand National
1987	Buick	Regal	GNX
1985 - 1986	Buick	Regal	T-Type
1970 - 1975	Chevrolet	Bel Air	Base
1970 - 1972	Chevrolet	Biscayne	Base
1970 - 1974	Chevrolet	Blazer	Base
1970 - 1972	Chevrolet	Brookwood	Base
1978 - 1980	Chevrolet	C10	Big Ten
1975 - 1980	Chevrolet	C10	Cheyenne, Custom Deluxe
1975 - 1986	Chevrolet	C10	Silverado, Scottsdale, Custom
1968 - 1974	Chevrolet	C10 Pickup	Base
1968 - 1974	Chevrolet	C10 Suburban	Base
1975	Chevrolet	C10 Suburban	Custom Deluxe, Silverado, Scottsdale
1986	Chevrolet	C20	Base
1981 - 1986	Chevrolet	C20	Custom
1975 - 1980	Chevrolet	C20	Custom Deluxe
1981	Chevrolet	C20	Deluxe
1975 - 1986	Chevrolet	C20	Silverado, Cheyenne, Scottsdale
1968 - 1974	Chevrolet	C20 Pickup	Base
1968 - 1974	Chevrolet	C20 Suburban	Base
1981 - 1986	Chevrolet	C20 Suburban	Custom
1975 - 1980	Chevrolet	C20 Suburban	Custom Deluxe
1981	Chevrolet	C20 Suburban	Deluxe
1975 - 1986	Chevrolet	C20 Suburban	Scottsdale, Silverado
1975 - 1982	Chevrolet	C30	Base
1975 - 1981	Chevrolet	C30	Cheyenne
1981 - 1986	Chevrolet	C30	Custom
1975 - 1980	Chevrolet	C30	Custom Deluxe
1981	Chevrolet	C30	Deluxe
1975 - 1986	Chevrolet	C30	Silverado, Scottsdale
1968 - 1974	Chevrolet	C30 Pickup	Base
1970 - 1975	Chevrolet	Camaro	Base, RS
1973 - 1975	Chevrolet	Camaro	LT
1970 - 1972	Chevrolet	Camaro	SS
1970 - 1974	Chevrolet	Camaro	Z28
1970 - 1974	Chevrolet	Caprice	Base
1973 - 1976	Chevrolet	Caprice	Classic
1976	Chevrolet	Caprice	Classic Landau, Classic Estate
1975 - 1976	Chevrolet	Caprice	Classic Sport
1973 - 1974	Chevrolet	Caprice	Estate
1975	Chevrolet	Caprice	Estate Wagon
1973	Chevrolet	Chevelle	Deluxe
1970 - 1972	Chevrolet	Chevelle	SS, Nomad, Greenbrier, Concours, Base, Malibu, Concours Estate
1972 - 1974	Chevrolet	Corvette	Base
1975	Chevrolet	Corvette	Stingray
1975 - 1976	Chevrolet	El Camino	Classic
1970 - 1974	Chevrolet	El Camino	Custom
1970 - 1976	Chevrolet	El Camino	SS, Base
1975	Chevrolet	G10	Sportvan, Chevy Van, Beauville
1970 - 1974	Chevrolet	G10 Van	Base, Sportvan
1978 - 1980	Chevrolet	G20	Nomad
1975 - 1980	Chevrolet	G20	Sportvan, Chevy Van, Beauville
1970 - 1974	Chevrolet	G20 Van	Sportvan, Base
1975 - 1985	Chevrolet	G30	Chevy Van, Beauville, Sportvan, Hi-Cube
1972 - 1974	Chevrolet	G30 Van	Base, Sportvan
1970 - 1976	Chevrolet	Impala	Base
1976	Chevrolet	Impala	Custom Landau, S
1975 - 1976	Chevrolet	Impala	Sport, Custom
1975 - 1980	Chevrolet	K10	Custom Deluxe, Scottsdale, Cheyenne, Silverado
1972 - 1974	Chevrolet	K10 Pickup	Base
1971 - 1974	Chevrolet	K10 Suburban	Base
1983 - 1984	Chevrolet	K10 Suburban	Custom
1975 - 1976	Chevrolet	K10 Suburban	Custom Deluxe
1975 - 1984	Chevrolet	K10 Suburban	Scottsdale
1975 - 1983	Chevrolet	K10 Suburban	Silverado
1975 - 1981	Chevrolet	K20	Cheyenne
1981 - 1986	Chevrolet	K20	Custom
1975 - 1980	Chevrolet	K20	Custom Deluxe
1981	Chevrolet	K20	Deluxe
1975 - 1986	Chevrolet	K20	Silverado, Scottsdale
1970 - 1974	Chevrolet	K20 Pickup	Base
1968 - 1974	Chevrolet	K20 Suburban	Base
1982 - 1985	Chevrolet	K20 Suburban	Custom
1975 - 1976	Chevrolet	K20 Suburban	Custom Deluxe
1975 - 1985	Chevrolet	K20 Suburban	Silverado, Scottsdale
1977 - 1981	Chevrolet	K30	Cheyenne
1981 - 1986	Chevrolet	K30	Custom
1977 - 1980	Chevrolet	K30	Custom Deluxe
1981	Chevrolet	K30	Deluxe
1977 - 1986	Chevrolet	K30	Silverado, Scottsdale
1968 - 1974	Chevrolet	K30 Pickup	Base
1976	Chevrolet	K5 Blazer	Base
1975 - 1976	Chevrolet	K5 Blazer	Cheyenne
1975	Chevrolet	K5 Blazer	Custom Deluxe
1970 - 1972	Chevrolet	Kingswood	Estate, Base
1973 - 1975	Chevrolet	Laguna	Base
1973	Chevrolet	Laguna	Estate
1975 - 1976	Chevrolet	Laguna	S3
1974	Chevrolet	Laguna	Type S-3
1973 - 1976	Chevrolet	Malibu	Base
1974 - 1976	Chevrolet	Malibu	Classic
1975 - 1976	Chevrolet	Malibu	Classic Estate
1973 - 1974	Chevrolet	Malibu	Estate
1976	Chevrolet	Malibu	Landau, Classic Landau
1970 - 1974	Chevrolet	Monte Carlo	Base
1973 - 1976	Chevrolet	Monte Carlo	Landau, S
1975	Chevrolet	Monza	S, 2+2
1970 - 1975	Chevrolet	Nova	Base
1973 - 1975	Chevrolet	Nova	Custom
1975	Chevrolet	Nova	LN, Police
1975	Chevrolet	P10	Step-Van, Base
1973 - 1974	Chevrolet	P10 Van	Base
1975 - 1988	Chevrolet	P20	Step-Van, Base
1969 - 1974	Chevrolet	P20 Van	Base
1975 - 1991	Chevrolet	P30	Base
1975 - 1990	Chevrolet	P30	Step-Van
1969 - 1974	Chevrolet	P30 Van	Base
1988	Chevrolet	R20	Cheyenne
1987 - 1988	Chevrolet	R20	Custom Deluxe, Silverado, Scottsdale
1988	Chevrolet	R30	Cheyenne
1987 - 1988	Chevrolet	R30	Custom Deluxe, Scottsdale, Silverado
1972	Chevrolet	Townsman	Base
1987	Chevrolet	V20	Silverado, Scottsdale, Custom Deluxe
1988	Chevrolet	V30	Cheyenne
1987 - 1988	Chevrolet	V30	Silverado, Scottsdale, Custom Deluxe
1989	Chevrolet	V3500	Cheyenne, Scottsdale, Silverado
1975 - 1978	GMC	C15	High Sierra, Sierra Grande, Base, Sierra Classic
1978	GMC	C15	Street Coupe, Heavy Half
1975 - 1976	GMC	C15 Suburban	Sierra Classic, High Sierra, Base, Sierra Grande
1968 - 1974	GMC	C15/C1500 Pickup	Base
1968 - 1974	GMC	C15/C1500 Suburban	Base
1979 - 1980	GMC	C1500	Heavy Half, Sierra Classic, High Sierra, Street Coupe, Base, Sierra Grande
1975 - 1978	GMC	C25	Base, High Sierra, Sierra Grande, Sierra Classic
1975 - 1978	GMC	C25 Suburban	Sierra Classic, Sierra Grande, High Sierra, Base
1968 - 1974	GMC	C25/C2500 Pickup	Base
1968 - 1974	GMC	C25/C2500 Suburban	Base
1979 - 1986	GMC	C2500	Sierra Classic, Base, High Sierra
1979 - 1982	GMC	C2500	Sierra Grande
1980 - 1986	GMC	C2500 Suburban	Base, High Sierra, Sierra Classic
1980 - 1982	GMC	C2500 Suburban	Sierra Grande
1975 - 1978	GMC	C35	Sierra Grande, High Sierra, Base, Sierra Classic
1968 - 1974	GMC	C35/C3500 Pickup	Base
1979 - 1986	GMC	C3500	High Sierra, Sierra Classic, Base
1979 - 1982	GMC	C3500	Sierra Grande
1975 - 1976	GMC	G15	Vandura, Rally, Rally STX
1972 - 1974	GMC	G15/G1500 Van	Vandura, Rally
1975 - 1978	GMC	G25	Rally STX, Vandura, Rally
1972	GMC	G25/G2500 Van	Base
1972 - 1974	GMC	G25/G2500 Van	Vandura, Rally
1975 - 1978	GMC	G35	Rally STX, Magnavan, Vandura Special, Vandura, Rally Camper Special, Rally
1974	GMC	G35/G3500 Van	Base
1972 - 1974	GMC	G35/G3500 Van	Rally, Vandura
1984	GMC	G3500	Vandura, Vandura Special, Rally STX, Rally Camper Special, Rally Custom, Rally, Magnavan
1970 - 1976	GMC	Jimmy	Base
1975 - 1976	GMC	Jimmy	Sierra Grande, High Sierra, Sierra Classic
1975 - 1976	GMC	K15	High Sierra, Sierra Grande, Base, Sierra Classic
1975 - 1976	GMC	K15 Suburban	Base, Sierra Grande, High Sierra, Sierra Classic
1970 - 1974	GMC	K15/K1500 Pickup	Base
1968 - 1974	GMC	K15/K1500 Suburban	Base
1979 - 1980	GMC	K1500	High Sierra, Base, Sierra Classic, Sierra Grande
1975 - 1977	GMC	K25	Base, High Sierra, Sierra Grande, Sierra Classic
1975 - 1976	GMC	K25 Suburban	Base, Sierra Classic, Sierra Grande, High Sierra
1970 - 1974	GMC	K25/K2500 Pickup	Base
1968 - 1974	GMC	K25/K2500 Suburban	Base
1979 - 1986	GMC	K2500	High Sierra, Sierra Classic, Base
1979 - 1981	GMC	K2500	Sierra Grande
1981	GMC	K2500 Suburban	High Sierra, Sierra Classic, Base, Sierra Grande
1977 - 1978	GMC	K35	Sierra Classic, High Sierra, Base, Sierra Grande
1968 - 1974	GMC	K35/K3500 Pickup	Base
1979 - 1986	GMC	K3500	Base, Sierra Classic, High Sierra
1979 - 1982	GMC	K3500	Sierra Grande
1976 - 1978	GMC	P15	Value Van, Base
1972	GMC	P15/P1500 Van	Base
1975	GMC	P25	Value Van, Base
1968 - 1974	GMC	P25/P2500 Van	Base
1979 - 1983	GMC	P2500	Base, Value Van
1975 - 1977	GMC	P35	Base, Value Van
1970 - 1974	GMC	P35/P3500 Van	Base
1974	GMC	P35/P3500 Van	Motorhome
1979 - 1990	GMC	P3500	Value Van, Base
1987	GMC	R2500	Base, Sierra Classic, High Sierra
1987 - 1988	GMC	R3500	Base, High Sierra, Sierra Classic
1971 - 1976	GMC	Sprint	Base
1972 - 1974	GMC	Sprint	Custom
1975	GMC	Sprint	High Sierra
1976	GMC	Sprint	Sierra Madre Del Sur
1975 - 1976	GMC	Sprint	SP, Classic
1987	GMC	V2500	Sierra Classic, High Sierra, Base
1987 - 1988	GMC	V3500	Base, Sierra Classic, High Sierra
1972	Pontiac	Ventura	Base