[Alan Roehrich]

I do not know for sure how much testing and sorting they do these days, seeing what gets sent out in a box often leaves me thinking there's not much QC at all any more. They have to do a fair amount though, because the cost of shipping a lot of bad plugs to an OE would be tremendous.

Despite using the hotter RC12YC, my jetting, timing, and even air bleeds are real similar to Jimmy's tune up, and they make close to the same power, being very similar engines.

A hot plug might cause a problem in a circle track application, where it had plenty of time to get really hot. However, in a drag race engine that leaves the starting line at 100 F, and is barely 160 F at the finish line 10 seconds later, you'd need a really hot plug to have a heat range problem.