both sets as they come in the box pre gapped. only thing i can put it down to is the fact the iridiums use a very fine centre electrode and pointed earth strap vs the std larger electrode/strap on the std plug
both sets as they come in the box pre gapped. only thing i can put it down to is the fact the iridiums use a very fine centre electrode and pointed earth strap vs the std larger electrode/strap on the std plug