Spark plug for 25 master series

[Charlie G]

I found Champion Spark plugs in original boxes labelled w10 and others W18.  Are these compatible for the 1925 Master series?

 

Charlie G

Edited October 10, 2017 by Charlie G (see edit history)

[dibarlaw]

They are compatible except they are too tall to fit under the spark plug cover.   The Champion "6" was what originally was specified with a longer reach than the W18.  The original equipment AC Titan of the period has the same long reach with a 7/8:" Hex. The only other 7/8 " Thread plug available now is a Motorcraft 3076. The longer reach 3077 has been discontinued.

[Charlie G]

Thanks Larry

 

Any suggestions as to where to find new plugs that would fit under the spark plug cover?

 

Charlie G

[dibarlaw]

The Motorcraft  3076 is available through most auto parts stores. That is what I am running in both the 1925 Standard and Master. I use a 90 degree boot on them and they fit under the cover.

Larry