Does anyone know??

[Phil Noonon]

Have a repro Thomas head that requires 14mm spark plugs. Does anyone know if champion makes a sparkplug with removable top. I want to use screw on thumb nuts. I am not having any luck finding any info....champion may not make such a plug. Thought I would ask here.

Thanks!
Phil Noonon

 

[Jim Brierley]

I believe Champion discontinued that type of plug years ago, and doubt if they ever made that style in 14mm. Before you install the head screw in a plug to determine the proper length of plug needed. If 1/2", use an H-14 plug, if 3/4", use an N-14.