Ford F15 Cab 11 CBW70

[Tony Smith]

Originally Posted by mgs44

Just bought 1940 Ford f15 11. Cant get hold of sparkplugs, in manual J10 or J9. Can any one tell me a replacement please.

Letting us know where in the world you are might make it easier to know what brands are common in your neck of the woods.

The original plugs in the manual are listed as Champion J9-COM or H10. Both are 14mm thread plugs with the J plugs having a 3/8" long thread and the H plugs having a 7/16" long thread. The head thickness means that the 3/8" reach plugs are shrouded within the thread and foul up more often, so 7/16" reach plugs are more commonly used, although the 3/8' plugs are useful for commonality if you run other WW2 vehicles. (The 3/8" plug is equivalent to the AC44 plug used on Chev CMP, Jeep, Dodge, GMC CCKW, WLA Harley, etc..). The 3/8" plugs are rarely used these days and would likely be a backorder for stock.

If you really must run the 3/8" reach plugs, equivalents are:

AC 44
Autolite 303 (Old No A7 or A5)
NGK B6S
Denso W20S-U

If you can't find NOS H10 plugs (7/16" reach), some alternatives are:

Champion H10C
AC 45L
Autolite 216
NGK B6HS
Denso W20FS-U