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Join Date: Oct 2005
Posts: 294
12mm spark plug thread pitch?

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
Old 02-13-2006, 08:00 PM
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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..
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Twinplug, head work, case savers, rockers arms, etc.
Old 02-14-2006, 05:43 AM
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