MTFCA Forum

I have several champion 31 spark plugs. Can they be used in a model T? When I looked at a crossover chart they they crossover to champion 25. Thanks!

What’s the difference. Heat range or?

By the authority vested in me by a this bunch of outlaws,I hereby grant you permission to use those classic plugs in in your automobile. They should work just fine with a little cleaning. You might try a cotton buffing wheel and red rouge to clean the porcelain.

It's a commercial application plug, I've seen them in it and miss engines, put a set in an old motorcycle, and I can't see any reason why they wouldn't work in a T.