Degrees timing

[Sashap]

i just read several places that the ignition modules that are aftermarket do not have the proper timing curve built in and do not do base mode correctly. Is this true? I have tried a cheap aftermarket as well as ACDelco d1964a. Both perform exactly the same. Neither either leaves base mode or simply don’t enter it. Wtf?

 

[Sashap]

To all pros out there. Nobody mentioned that there are two types of est ignition modules for the 3.0. Same part number but different breed. The one ending in a stamped number 369 is automotive only with a timing curve that does not advance until 2400 rpm and then maxed out around 4000 rpm. The one stamped with a 399 is used for marine and some high performance uses with the correct curve.
Runs perfect now. Plus the automotive one has no base mode.