Wasn't there something about making a bolt hole/sensor(pickup) hole oblong , to get a little more timing out of a magnum? I don't have a magnum engine, so never looked into it. Maybe someone that knows the details, will chime in.
That is the “Crank Position Sensor” hole and sensor mounting screws.
It is also possible to reach up through that hole and “customize” the ignition retard for any cylinder that would benefit by grinding the flexplate slot.
It might also be possible to custom make a plate with slots and mount this custom piece on the front engine shaft near the damper with the CPS being moveable.
The slot pattern is not just 8 slots, the double slot on the flexplate tells the PCM the cylinder order.
Mother Mopar could have very cheaply added a switch or rheostat to the PCM computer to control timing for 85/87/93 gasoline.
The IAT sensor or engine coolant sensor can be “fooled” into slight timing adjustments.
Many home natural gas furnaces have an adjustment screw on each burner to change the air to fuel ratio.
It might be beneficial to drill and tap such air flow regulating screws into each of the 8 runners of the “beer barrel” intake manifold, but the question is “where.” ?
The end of such screws should be filed into “flat” that could slow flow or adjust swirl.
Locating such airflow screws downstream from the fuel injectors might better “atomize” the mixture.
The most significant fuel economy change would come from running a leaner air to fuel ratio, not ignition timing.
The Fuel Economy Calculator program from Performance Trends Co. predicts a gain of 1.5 MPG at 60 MPH at an A/F ratio of 16.7 rather than 14.7
Before the EPA most automobile engines ran at 18 A/F ratio at highway cruise.
