I'd like to see some ACTUAL results from using different brands of the same heat range plugs. I would guess that there wouldn't be much difference to measure. I would have to say yes to the original question. At some point sharp edges and projectile tips will retain more heat in the combustion chamber. Common sense.
- as long as you don't read anything else in to the question - which is NOT SOP for this site - which is ok.
- as long as you don't read anything else in to the question - which is 