NGK R7420-10 Spark Plug

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Rating

4.5 / 5 Overall
NGK	R7420-10
Brand	Code
4.5 / 5 Materials
Platinum	Iridium
Ground electrode	Center electrode
4.5 / 5 Design
Slant	Fine Wire
Ground type	Center type

Specifications

0.7mm (.028")	10
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
21mm (.827")	21mm (13/16")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (1)

Alternative spark plugs found in cross-reference docs provided by manufacturers

IRE01-31

Iridium-Platinum

4.3/ 5

.028"21.5mm, ⌀14x1.25HR 31

Deep reference (1)

A second level of cross-reference: if A=B and B=C, then A=C

R6725-10

Platinum

4.0/ 5

.028"21.5mm, ⌀14x1.25HR 10

One step colder (1)

Colder spark plugs with same characteristics for moderately tuned engines (75–100 hp increase)

R7420-11

Iridium-Platinum

-

4.5/ 5

.028"21mm, ⌀14x1.25HR 11