12mm spark plug thread pitch?

[Bullet Bob]

I plan to machine my heads for twin plug ignition and I need to order the tap. I don't have a one on hand, but I plan to go with a 12mm plug. Anyone know what the thread pitch is for 12mm plugs?

Thanks,
Bob

[cgarr]

It the same as the 14mm 1.25 do some test taping with it and check your plug in some alum, new taps are to sharp I found out.. you may want to take the real sharp edges off a new tap so your plug is not loose..