Originally Posted by
daveswaves
Dick, you may be better off firing the two coils in parallell rather than in series. The scr in the switch box is more than capable of providing current to the new lower resistance. Both in series is limiting your current flow to 1/2 of what the coil normally sees, that means smaller magnetic field and much smaller spark. Just a thought. Tim, the GM hei modules will work well, they use an inductive type trigger using reluctance. Assign some numbers to the main and secondary bank so we can think about firing order on both sides. Waste spark is one way to go, 4 coils sparking every 180 degrees. You could use a merc 4 cyl trigger and related linkage to fire the GM HEI module, just have to figure out how to sequence the modules. Normally the rotor looks after that for you. A standard GM 8 cyl hei with coil in cap would do everything for you, Good up to 10000 rpm, nicely matched. All you would have to do is adapt a merc pulley to the end of the distributor where the oil pump drive is, not too hard. The vehicle ones have a fairly chunky cap, Malory makes a narrower version that is pretty slick. I am willing to expand further as questions arise.