E3 Spark plugs do work

We where using MSD 7al, Indy 440-1 alum. heads with the same NGK 5672-8 plugs that made the most hp in testing before this. After more than 40 yrs. of racing I always try to use the parts that make the most power with accurate testing. We where very surprised with the results ourselves. This was on a dyno not rear wheel hp. Just hoping to pass along some info to others.