NGK R2556B-9 Spark Plug

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Rating

4.5 / 5 Overall
NGK	R2556B-9
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")	9
Gap	Heat range
⌀12mm	1.25mm
Thread diameter	Thread pitch
26.5mm (1.04")	16mm (5/8")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

One step colder (1)

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

R2556B-10

Iridium-Platinum

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4.5/ 5

.028"26.5mm, ⌀12x1.25HR 10