The Rapidfire plugs were developed to cut down on irregular misses by GM engineers who were doing a lot of emission testing and monitoring cylinder-by-cylinder. I believe there are a couple of SAE papers about this. So it is not all smoke and mirrors.
R.
I believe there is a US Patent Number on the Rapidfire spark plugs package that you can look up and read on Google’s Patent service. Patents usually have a “History of the Invention” section that is well worth reading and points out key past improvements in spark plugs.
