Spark Plug Cross Reference
 
7/8" spark plugs cold down to hot 
New Champion
Old Champion
A--C
Auto Lite
Edison
Bowers
Globe
Blue Crown
Leonard
W-10
0 Com
73 Com
 
40-T
C78-C
6
73-Com
4-F
W-14
1 Com
74 Com
T-7
37-TS
C78-N
7
74-Com
4
W-18
2 Com
C 77L
T-9
35-S
78-N
8
75-Com
3
W-20
3 Com or  No 20
78 Com
T-11
31-T
78-H
9
76-Com
2-A
W-89D
44
19
3077
 
 
10
78L-Com
1-A
W-85N
901
 
 
 
 
 
 
 
W-95D
45
 
 
 
 
 
 
 
The bottom three plugs are special extension models
Recommended torque for a cast iron head is 37 lb-ft 35 lb-ft for aluminum
10 mm cold down to hot 
New Champion
Old Champion
A--C
Auto Lite
Edison
Bowers
Globe
Blue Crown
Leonard
UY-6
Y-4A
104
P-4
3-S
10C
F-10
T-4
10-F
UY-6
Y-6
106
 
4
 
F-11
T-6
10-E
UY-6
Y-8
108
P-6
2-S
10N
F-11A
T-8
10-D
Recommended torque for cast iron head is 14 lb-ft 12 lb-ft for aluminum
14 mm cold down to hot 
New Champion
Old Champion
A--C
Auto Lite
Edison
Bowers
Globe
Blue Crown
Leonard
J-57-R
J-2
42
A3
58-T
C14S
12A
M-2-Com
14-G
H-8
H-9
43L
A5
57-TS
14C
13
M-4-Com
14-F
CJ-8
J-8
45
A7
55-S
14N
14
M-7
14-E
UJ-12
J-12
47
A11
52
14H
15
M-11
14-C
Recommended torque is 30 lb-ft for cast iron heads 28 lb-ft for aluminum
18 mm cold down to hot 
New Champion
Old Champion
A--C
Auto Lite
Edison
Bowers
Globe
Blue Crown
Leonard
D-6
4 Com
82S
 
 
C18C
  
R-82
6
D-9
5 Com
83-S
B5
49-TS
18C
24
83 Com
6-F
D-14
6 Com
84
B7
48-TS
  
25
84 Com
6-A
D-16
7
85-S
 
45-S
18N
26
85 Com
5-HD
D-16
8 Com
86
B9
43-TS
 
27
86
9
D-21
C-15
87
B11
43
18H
28
87-S
5
D-23
10 Com
88-L
388
44-HS
 
 
88
8
D-89D
49
18A
 
42-T
 
 
 
 
The bottom plug is a special extension model
Recommended torque for cast iron is 34 lb-ft 32 lb-ft for aluminum heads
For 1/2" pipe plugs recommended torque in cast iron is 35 lb-ft
All values are for clean lubricated threads.
Over tightening a plug with a .025 gap will cause the gap to increase to .031.
Created from a 1947 heat range list and current Champion list.
by Chris Klossner
Klossner@antiquetractors.com
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