For some time NGK and Denso have sold plugs with either a "U" grooved bent electrode or a "V" grooved center electrode. Considering these manufacturers are well respected, I assume there must be some measurable benefit to running these sparking plugs. However, can't recall reading any postings on this forum regarding the virtue of these grooves.

Is there anyone out there who can actually attest to the supposed benefit of these plugs?

I happen to be using Bosch and or Autolite for no particular reason other than both brands have served me well. Neither offer the "groovy" style plugs. Anyone take their tiny die grinder with jeweler's bit to cut a "v" groove in their plugs? Is it worth the effort?

Thank you in advance.