Champion 121 spark plug for the 1970 Chevrolet Impala V8 7.4L and other vehicles fires the spark that ignites the air-fuel mixture in a cylinder.
- Champion Copper Plus series
- Copper core center electrode allows accurate control of heat range for longer life
- Coated shell resists corrosion in harsh environments
- Built-in resistor minimizes electrical interference to protect sensitive electronics
- Engineered for reliable ignition in all weather conditions
Quick facts
- Part: Champion 121 spark plug
- Fits: 1970 Chevrolet Impala V8 7.4L and other vehicles
- Material: Nickel (center electrode tip)
- Condition: New
A worn plug can show up as hard starting, a rough idle, misfires or lower fuel economy. Worn plug wires, a worn distributor cap or a weak coil can be behind these signs too, so find the cause before you buy plugs. Each cylinder takes one plug: eight for the V8 engines and six for the V6 engines.
Fits
It is listed for a wide range of Chevrolet models and several other makes, such as the 1970 Chevrolet Camaro V8 6.6L and the 1971-1979 Chevrolet C60 V8 6.0L or 7.0L and the 1973-1974 C60 V6 6.2L or 7.1L. It is built to meet OE fit, form and function. If your car is not named here, look up your year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 6 or 8, one per cylinder (varies by engine)
- Thread diameter: 14 mm (0.551 in)
- Seat type: Tapered
- Core nose length: 0.655 in
- Pre-gap size: 0.040 in (1.02 mm)
Build and materials
- Plug type: RV8C
- Grade: Standard replacement
- Resistor type: Yes
- Center electrode tip material: Nickel
- Condition: New
- Country of origin: China
In the box
The spark plug itself. Washers are not included.
Installation notes
- Comes pre-gapped, which simplifies installation.
Interchange: 41821 · MR43T · R42CT · R42T · R43CT · R43T · 136 · 144 · 145 · 7568 · 7968 · HR8A · HR8AC · WA125TR4 · WA145TR4 · BL8 · RBL8 · RV8C · 5038 · T20RU · 4339492 · AF3 · AF3C · ARF3 · ARF4 · ASF3C · ASF4C · 2405 · 2927 · B6FS · ESP055
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
41821, MR43T, R42CT, R42T, R43CT, R43T, 136, 144, 145, 7568, 7968, HR8A, HR8AC, WA125TR4, WA145TR4, BL8, RBL8, RV8C, 5038, T20RU, 4339492, AF3, AF3C, ARF3, ARF4, ASF3C, ASF4C, 2405, 2927, B6FS, ESP055
Frequently Asked Questions
Does the Champion 121 spark plug fit a 1970 Chevrolet Impala V8 7.4L?
Yes. Champion 121 is listed for the 1970 Chevrolet Impala V8 7.4L. For other cars and engines, look up your year and engine in the "Vehicles it fits" section.
What gap do Champion 121 spark plugs come set to?
Champion 121 comes pre-gapped at 0.040 in (1.02 mm), which simplifies installation.
What thread size does this RV8C spark plug have?
This RV8C spark plug has a thread diameter of 14 mm (0.551 in) and a tapered seat.
Is this Copper Plus spark plug a resistor type?
Yes. It has a built-in resistor that minimizes electrical interference and protects sensitive electronics.
Does this spark plug come with a washer?
No, washers are not included with this spark plug. The seat type is tapered.
