NGK LFR6A 6668 Spark Plug

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Rating

3.1 / 5 Overall
NGK	LFR6A
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.3 / 5 Design
Standard	V-Cut
Ground type	Center type

Specifications

0.9mm (.035")	6
Gap	Heat range
⌀14mm	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

Bigger gap (13)

0.1..0.3 mm gap increase for better performance given your ignition system can handle it

SK20HR11

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 20

SK20HPR-L11

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 20

SK20HR-A11

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 20

VKH20

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 20

ILFR6J-11K

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 6

ILFR6T-11

Iridium-Platinum

4.2/ 5

.043"26.5mm, ⌀14x1.25HR 6

PLFR6C-10G

Platinum

3.8/ 5

.039"26.5mm, ⌀14x1.25HR 6

PLFR6A-11

Platinum

3.8/ 5

.043"26.5mm, ⌀14x1.25HR 6

LFR6AIX-11

Copper-Iridium

3.8/ 5

.043"26.5mm, ⌀14x1.25HR 6

LFR6CGP

Copper-Platinum

3.5/ 5

.039"26.5mm, ⌀14x1.25HR 6

LFR6A-11

Copper

-

3.1/ 5

.043"26.5mm, ⌀14x1.25HR 6

LFR6A-11 BLYB

Copper

-

3.1/ 5

.043"26.5mm, ⌀14x1.25HR 6

LFR6C-11

Copper

-

3.1/ 5

.043"26.5mm, ⌀14x1.25HR 6

One step colder (1)

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

LFR7A

Copper

-

3.1/ 5

.035"26.5mm, ⌀14x1.25HR 7