Original Champion Flathead Spark Plug Question

[Sutton Speed]

Hey guys... So I have an original set of Champion 48-12405-A2, 6 COM Flathead spark plugs. From the little bit of info I can find on them looks like they are for earlier flatheads. Will these plugs work fine on a ‘45 59AB? See attached photos. Thanks so much for the info!

 

[51 MERC-CT]

'45 used 14mm plugs, are they 14mm? or 18mm which is '37 and older

 

[petehoovie]

Hey guys... So I have an original set of Champion 48-12405-A2, 6 COM Flathead spark plugs. From the little bit of info I can find on them looks like they are for earlier flatheads. Will these plugs work fine on a ‘45 59AB? See attached photos. Thanks so much for the info!

....

 

[Bored&Stroked]

Hey guys... So I have an original set of Champion 48-12405-A2, 6 COM Flathead spark plugs. From the little bit of info I can find on them looks like they are for earlier flatheads. Will these plugs work fine on a ‘45 59AB? See attached photos. Thanks so much for the info!

They're not even the correct thread size . . . you need 14mm.

 

[Bored&Stroked]

Just run NGK B6L plugs

 

[Bob NH]

Bored & stroked has it right, these plugs are great !

 

[V8COOPMAN]

Hey guys... So I have an original set of Champion 48-12405-A2, 6 COM Flathead spark plugs.

You would probably be quite surprised at what that NOS set would be worth to a true restorer. Don't just use them in something 'cuz they fit! DD

 

[David J]

That is the correct plug for a 1960 John Deere 630 .

 

[cadillac512]

That is the correct plug for a 1960 John Deere 630 .

And it only requires two!

 

[V8COOPMAN]

That is the correct plug for a 1960 John Deere 630 .

You sure, David? That looks like a '35 Ford part number. DD

 

[RalphG]

They look a little short and fat compared to the J 10 or H 10 Champions we always used in the flatheads from 39 up. Still running some ancient Champions like that in the 52 Merc. and they work fine.

 

[Bob C]

The parts book shows Spark plug-heavy duty service cars (No. 6 Com'l) 1935-36