I recently acquired a late 50s NOS ‘ZC’ unit, designed to replace a Loadomatic distributor. It’s vacuum connection hooks directly into the Holley 4000’s spark control valve position. Would you know if that intended vacuum signal strength (way weaker than manifold vacuum?) will likely rule out the practicality of using the Mallory’s vacuum advance brake when paired with a modern carb?
BTW: I also wonder if my 55’s tach cable will work with this model? I know the modern (discontinued) Mallory dual point units require a special cable.
There are virtually no exploded diagrams & instructions online for lube/maintenance or advance adjustment of this vintage distributor. It’s NOS operation manual left that out. If anyone has relevant experience/advice to offer, I would appreciate it. I do have a Sun distributor machine, so I CAN check advance operation/curve, but recurving would require special springs/knowledge I don’t possess. The unit should also be disassembled and cleaned, since the 62 year old factory lube has likely turned to varnish. So, I’m thinking it should probably be sent to someone who specializes in rebuilding/adjusting vintage Mallory distributors (?). Recommendation?
I am tempted to just drop it in and see how it’s factory settings would work with my original motor, but installing it requires cutting the ends off my plug wires. I also wouldn’t want to mess with the spark control (currently functioning perfectly) setup on my Pony teapot, unless I was actually needing to replace the OEM distributor (only bought the Mallory since I want to stay 6V after eventual carb/manifold upgrade).
6 VOLTS/POS. GRD. NW INDIANA