Fast 650 wrote on 07/12/19 at 10:35:57:The rotor and ignition module changed in the mid 90's for the LS. Trigger location changed on the rotor so static timing is different. And the module has to match the rotor or the timing is way off, which sounds like the curve may have changed then also.
Yes, the trigger points are different, but I believe the static timing is the same. But you really can't check static timing.
The old rotor has a short trigger plate and the new one has a long one.
The old rotor trigger point has a large offset from 0°TDC.
Whereas the new is short.
I'll have to put a timing wheel against the rotors and check.
But I think the new rotor is set up to spark somewhere between the beginning and end of the trigger plate.
Whereas the old just triggers it.
I believe the change was for accuracy, not that this type of timing is incredibly accurate. Also may indicate that the processor was changed.