Review on Enhance Performance with Denso SC20HR11 Spark Plug by Eric Froedge

I'm pretty sure these are good spark plugs as they are original in my Toyota Corolla. However, when I received this set of 4 from Revain, the OEM packaging was already open. There are already signs of breakage on the ground electrodes.? I thought they were a factory rating of .44 as stated on this website (or .43 as stated by Toyota). But after measuring the distance, it was only 0.41. I don't know if they have been tampered with since the OEM box was opened. As far as I know it is not recommended to swap the iridium plugs. Update: This is my first time buying a Denso, I've always used NGKs and never had a problem with them. The gap was still not up to specification. One thing I forgot to mention in my original review: The ground electrode tip has sharp edges from cutting or grinding during manufacture that have not been cleaned. That second set is the worst. I decided to buy NGKs from my local dealership and as usual they clean better and meet the specs.