Specs for this Mallory coil do show a 1.4 ohm primary. Jegs and Summit still sell this coil, but I can't find a web site for Mallory the company. I haven't been able to find a Mallory recommended ballast resistor resistance, but to get somewhere around 8-9 volts after starting the engine, you'd need around 0.6 ohms like I said above. And at this low resistance (0.6 + 1.4 = 2 ohms) I'll bet your points won't last long.
Me? I'd find a more "standard" coil like the Delco E552C ( $25.99 @ RockAuto) which is the recommended coil for a 1957 Chevy 235 truck among a bunch of other 12 volt GM vehicles with points ignition. Primary coil resistance is 3.1 ohms. Should work well with your ballast resistor, but isn't chrome plated like the Mallory coil.
Last edited by Bill Hanlon; 04/25/2026 3:19 AM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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