NGK GR4 spark plug for the 1967 Dodge Charger V8 4.5L, the 1967-1978 Charger V8 5.2L, the 1968-1971 Charger V8 7.0L, the 1968-1974 Charger 6-cylinder 3.7L, the 1970-1972 Charger V8 7.2L, the 1972-1973 Charger V8 5.6L, the 1974-1978 Charger V8 5.9L and other vehicles ignites the air-fuel mixture in the cylinder and is one of the NGK spark plugs in the V-Power line. It is made for better ignitability than standard nickel plugs, which helps with quicker starts and a smoother idle.
- V-Power plug with a V-cut nickel alloy center electrode and a concave ground electrode
- High grade alumina silicate ceramic insulator for dielectric performance
- Trivalent metal plating for anti-corrosion and anti-seizing properties
- Solid copper core, 98% pure, for heat dissipation, conductivity and wide heat ranges
- Cold-rolled threads that prevent cross-threading and damage to cylinder heads
Quick facts
- Part: NGK GR4 spark plug
- Fits: the 1967 Dodge Charger V8 4.5L, the 1967-1978 Charger V8 5.2L, the 1968-1971 Charger V8 7.0L, the 1968-1974 Charger 6-cylinder 3.7L, the 1970-1972 Charger V8 7.2L, the 1972-1973 Charger V8 5.6L, the 1974-1978 Charger V8 5.9L and other vehicles
- Material: nickel alloy center electrode with copper core, ceramic insulator
- Condition: New
Hard starting, a rough idle or a misfire may point to worn plugs, though a weak coil, a bad wire or a fuel problem can produce them too, so track down the cause before buying a set. With the engine off and cool, a worn-down electrode, a cracked ceramic or oil on a removed plug is the first thing to look at. A shop can run the ignition tests.
Fits
As a Jeep Cherokee spark plug, it fits the 1974-1977 Cherokee 6-cylinder 4.2L, the 1974-1978 Cherokee V8 6.6L and the 1974-1983 Cherokee V8 5.9L, and many other vehicles take it as well. Each engine needs one plug per cylinder. It is best on vehicles with OE nickel alloy plugs and not recommended on vehicles with factory precious metal plugs. If your car is not named here, find your engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: one per cylinder (4, 6 or 8, depending on the engine)
- Thread size: M14 - 1.25, metric
- Reach: 0.750 in (19.0 mm)
- Seat type: flat, with crush washer
- Heat range: 4
- Pre-gap: 0.040 in (1.0 mm)
- Insulator height: 2.20 in (56.0 mm)
Build and materials
- Resistor type: yes, 5000 ohm
- Center electrode: nickel alloy with copper core
- Ground electrode: nickel, J-gap, one electrode
- Insulator: ceramic
- Plating: trivalent metal
- NGK stock number: 2635
- Condition: New
- Country of origin: Japan
In the box
One spark plug with its crush washer.
Interchange: 2635
Frequently Asked Questions
Is the NGK GR4 the right spark plug for a 1967-1978 Dodge Charger V8 5.2L?
Yes. The NGK GR4 fits the 1967-1978 Dodge Charger V8 5.2L, which takes eight plugs, one per cylinder.
Is the NGK GR4 the right spark plug for a 1963-1965 Chevy Impala 6-cylinder 3.8L?
Yes. The NGK GR4 fits the 1963-1965 Chevrolet Impala 6-cylinder 3.8L, which takes six plugs, one per cylinder.
What thread size and reach do these NGK V-Power plugs have?
The NGK GR4 has an M14 - 1.25 metric thread, a 0.750 in (19.0 mm) reach, a flat seat with a crush washer and heat range 4.
How can I tell if an NGK V-Power plug like this is worn out?
Hard starting, a rough idle or a misfire can be signs of a worn plug. With the engine off and cool, a worn-down electrode or a cracked ceramic on a removed plug also shows wear.
Is the NGK GR4 right for engines with factory precious metal plugs?
No. The NGK GR4 is best on vehicles with OE nickel alloy plugs and is not recommended on vehicles with factory precious metal plugs.
