[Michael C Henry]

My car came with a Mallory system.dist, coil ,HYFIRE IV and a proportional rev limitter # 644(all 87 era). I haven't tested it . I was sure that anything and everything worked and was nessacary.Recently Mallory tech wrote that the #644 proportional rev limitter would not work with the HYFIRE IV. It was intended for a simple distrib and coil setup..My stuff probably pre dates this tech.Could he be wrong ? And why does a new HYFIRE IV cost more than a HYFIRE VI ( Summit prices )?The VI has multiple spark and two stage rev limitter.What am I not understanding or not seeing?
Also has anyone wished they had installed the Mallory voltage spike protector?