Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
Re: 69 El Camino distributor upgrade
The singular thing GM did when they went from a 6 volt system, to their point triggered, ballast resisted 12 volt one, they used the best coil available at the time, built by their Delco-Remy subsidiary, did a heavier resistance to run it than other manufacturers used, and never looked back.
Incredibly, that stock good quality point coil WILL work with an HEI module, on systems that do not run a resistor, or resistor wire, and, even the MSD CD multi-spark systems. Of course, there are some things to adhere to, spark plug gaps MUST be kept to a maximum of .045 (this because the processors, MSD, HEI, don't like excessive gaps), good magnetic suppression spiral core wire sets, and the worthwhile coils mounted with the terminal end UP, not on its side, NOT up side down.
The basic GM point coil I refer to is what Andover Industries used to develop the performance coils for many after market companies, like MSD, and the "Blaster" series coils. After the EPA started the Witch Hunt to eliminate oil filled coils because they were "toxic oil filled killers", first, Mexico, then China began making them again, oil filled, but, like the Blaster 2 of today, very bad, the EPA forced many manufacturers to only make epoxy filled coils, not even close to being a good alternative to the oil filled originals.