New Model T spark plugs?

I'm brand new to this forum and am here for a little different reason than most. I have an original running Montgomery Wards Sattley 1-1/2 horse stationary engine made in 1927. It was made for Wards by Nelson Brothers. The best part of it is that it uses parts from old Model T's...valves, piston, seats, rings, connecting rod, and spark plug. It currently has a Champion 31 in it, an old two piece plug. The manual says the replacement is 1/2 inch Champion extension spark plug, and is listed with the interchangeable Ford T parts. I'm wondering what the new plug number would be to this? I'd like to use the old one when showing off, but would like a new one just to run the engine on to save the old one. I see 3X mentioned on the A board, but I'm not sure if this is what the Model T took. Any help is surely appreciate, and I've got plenty of room out here in the dusty west if someone wants to store their old buggy where rust isn't a problem...(grin)



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The available Model T spark plugs are:

1. Champion X, about $25 each

2. Champion 25 (or A-25), about $9 each

3. Motorcraft F-11, about $4 each

4. Autolight 3095, about $4 each



The Champion 3X used in Model A's is 7/8" pipe thread. Model T threads are 1/2" pipe.



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<ul>[*]Northwest Vintage Speedsters[/list]

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Do you know which of these has the highest heat range???



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