DENSO Auto Parts 6021 spark plug for the 1965-1968 Chevrolet Impala V8 5.4L, the 1966 Impala V8 7.0L, the 1968 Impala V8 5.0L and other vehicles ignites the air-fuel mixture in each cylinder.
- Patented U-Groove ground electrode for a larger flame front, improved ignitability and increased engine efficiency
- Copper core center electrode with a nickel tip for thermal conductivity
- Pre-gapped to 0.7 mm
- Resistance of 5000 ohms
Quick facts
- Part: DENSO Auto Parts 6021 spark plug
- Fits: the 1965-1968 Chevrolet Impala V8 5.4L, the 1966 Impala V8 7.0L, the 1968 Impala V8 5.0L and other vehicles
- Condition: New
Hard starting, misfires, a rough idle or lower fuel economy can mean a plug is worn, though ignition and fuel problems produce similar symptoms, so work out the cause first. With the engine off and cool, a removed plug can be checked for a worn or deposit-coated electrode, and its gap measured against the 0.7 mm pre-gap.
Fits
Spark plugs for the 1975-1977 Chrysler Town & Country V8 6.6L, like those for the Impala above, are covered by this number, and many more vehicles are too. The plug is OE-grade. Look up your own car in the "Vehicles it fits" section further down this page.
Specifications
Fit and size
- Thread diameter: 14.0 mm
- Reach: 9.5 mm
- Hex size: 20.6 mm
- Seat type: Flat
- Heat range: 14
- Pre-gap: 0.7 mm
- Quantity per vehicle: 8
Build and materials
- Ground electrode: 1, U-Groove tip design
- Electrode materials: copper center core, nickel center tip, nickel ground electrode core
- Resistance: 5000 ohms
- Condition: New
- Country of origin: China
In the box
One spark plug, sold individually. A V8 takes eight plugs, one per cylinder.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Does this Chevy Impala spark plug fit the 1965-1968 Impala V8 5.4L?
Yes. DENSO Auto Parts 6021 fits the 1965-1968 Chevrolet Impala V8 5.4L, and it also fits the 1966 Impala V8 7.0L and the 1968 Impala V8 5.0L.
Are these Camaro spark plugs right for a 1968 Chevrolet Camaro V8 5.4L?
Yes. DENSO Auto Parts 6021 fits the 1968 Chevrolet Camaro V8 5.4L and the 1967 Camaro V8 4.9L or 5.3L, and a V8 takes eight plugs.
What thread size and reach does this DENSO Auto Parts spark plug have?
This spark plug has a 14.0 mm thread diameter and a 9.5 mm reach. It also has a flat seat and a 20.6 mm hex.
What does the U-Groove ground electrode on the DENSO 6021 do?
The patented U-Groove on the ground electrode allows a larger flame front and improved ignitability. The ground electrode core is nickel.
What resistance and heat range does the DENSO 6021 have?
DENSO 6021 has a resistance of 5000 ohms and a heat range of 14. It has a copper core center electrode with a nickel tip.
