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Copyright © 2010
Brian G. Ahart
Unless otherwise noted, all pictures are property of Brian G. Ahart.
Written permission must be obtained before any photo is allowed to be used in any manner.
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Spark Plug Reference Matrix
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Plug Type |
AC |
Champion |
NGK |
Autolite |
Bosch |
| B, C, CA, WC, WD |
Non-Resistor (Magneto) |
45 |
J8 |
B6s |
295 |
W8E |
| U, A |
Non-Resistor (Magneto) |
C75 |
W14 |
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3075 |
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| WD, WD45, D10-D17 |
Resistor (Distributor) |
R45 |
RJ8C |
BR6s |
303 or 295 |
WR9EC |
NOTE: Non-Resistor plugs can be used with distributor ignition, but
Resistor plugs should not be used with magneto ignition.
AC Spark Plug Numbering System
Champion Spark Plug Numbering System (jpg, 126k)
NGK Spark Plug Numbering System (pdf, 174k)
Autolite Spark Plug Numbering System (pdf, 16k)
Bosch Spark Plug Numbering System (pdf, 2061k)
Spark Plug Cross Reference Spreadsheet (xls, 1704k)
Spark Plug Cross Reference
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