yea, i ordered the plug from sbp ,pablo. i had a sland head and the plug worked great but then i had replaced it with a MM head. The gap did not really matter after that. it ran good for a seconed then i pulled the plug and the piston had touched it just enough to just about close the gap on it. Luckly there was no damage.
So anyone reading this know it is a good plug but it probably wont work if you have the MM head.