Spark Plug Cross Reference Chart

 

Autolite Racing

Champion

NGK

NGK

Stock

Number

AC Delco

-N/A-

-N/A-

AR12
AR13
AR23
AR24
AR25
AR32
AR33
AR50
AR51
AR52
AR53

-N/A-
AR72
AR73
AR74

-N/A-
AR92
AR93
AR94
AR103
-N/A-
AR131
AR132
AR133
AR134
AR135
-N/A-
-N/A-
AR472
AR473
AR474
AR764
AR2592
AR2593
AR2594
AR3910
AR3911
AR3923
AR3924
AR3931
AR3932
AR3933
AR3934
AR3935
-N/A-

-N/A-

-N/A-

RV9YC
RV9YC
RV9YC

RV12YC

RV15YC4

RF9YC

RF9YC

N59YD

N61YD/N6YC

N63YD/N7YC

N9YC

-N/A-

J12YC

J12YC

J12YC

-N/A-

S57YC

S59YC

S61YC

RS9YC

RF10C

V55C

V57C

V59C

V63C

V63C

RV8C

N3C

S57C

S59C

S61C

RS12YC

C59

C61

N2C

C59YC

C61YC

RC9YC

RC12YC

C55C

C57CX

C59CX

C61CX

C63C

L87YC

R5674-9

R5674-8

R5674-7
R5674-6
BPR6FS
BPR6FS
UR4
AP8FS
AP7FS
R5672A-10
R5672A-9
R5672A-8
BP6ES

R5670-9
R5670-7
R5670-6
R5670-6

R5670-5
R5724-10
5724-9
R5724-8
BPR6EFS/TR6
AR6FS
R5673-10
R5673-9
R5673-8
R5673-8
R5673-7
R5673-6
R5671A-7
B9EFS
B9EFS
B8EFS
TR5
R5671A-10
R5671A-9
B9ES
R5672A-9
R5672A-8
BKR6E
FR5
R5671A-11
R5671A-10
R5671A-9
R5671A-8
R5671A-7
BP6HS

6468

5657

3535
4449
2623
2623
6630
2227
2127
3395
7405
6564
7333

3913
2891
6659
6659

7173
7993
6434
4175
3623
3323
4050
3442
3249
3249
4367
4256
4091
1085
1085
1049
2238
5820
5238
2611
7405
7173
6962
7373
6596
5820
5238
4554
4091
7331

436TS

438TS

40TS
42TS/43TS

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

M90

-N/A-

42S/R42S

43S/M43S/R43S

44S/45S/46S/C44S
-N/A-
-N/A-
-N/A-
-N/A-
-N/A-
-N/A-
436T
438T
MR41T
440T
-N/A-
-N/A-
-N/A-
-N/A-
-N/A-
-N/A-
S40XL
S41XL
-N/A-
436XLS

438XLS/440XLS

-N/A-

-N/A-

-N/A-

-N/A-

-N/A-

41XL

-N/A-

-N/A-


 

Heat Range Reference

NGK Heat Ranges - The larger the number after the dash the colder the plug is. Example a R5673-7 is a cold plug where a R5673-10 is a very cold plug

Autolite Heat Ranges - The larger the number the hotter the plug is. Example a AR3935 is hotter than a AR3932 plug which is very cold

Champion Heat Ranges - the larger the number the hotter the plug.  Example an N3C is hotter than an N2C plug