NGK B-4H Spark Plug

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Rating
Brand	Code
2.9 / 5 Overall
NGK	B-4H
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications
Gap	Heat range
0.7mm (.028")	4
⌀14mm	1.25mm
Thread diameter	Thread pitch
12.7mm (1/2")	21mm (13/16")
Reach	Hex size
Gasket	Removable Nut
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

How we find alternative spark plugs How we rate spark plugs

Cross-reference (2)

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

W14F-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 14

W10AC

Copper

-

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 10

Deep reference (4)

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

W14F-U

Copper

3.3/ 5

.028"12.7mm, ⌀14x1.25HR 14

W10AC

Copper

-

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 10

425

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 6

425

Copper

-

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 6

Two steps colder (1)

Two steps colder spark plugs with same characteristics for heavily modified engines (150-200 hp increase)

B6HS

Copper

-

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 6