most probably these ?
12558948 COIL
edit:
interesting testing that describe how coil performance matters:
- Description and bench-testing of LS1, LS2 (D-580) and "Yukon" (D-585) coil-near-plug GM coils.
- long testing video (check last 4 minutes ) http://video.google.com/videoplay?do...65754251&hl=en
Interesting use of capacitors in the circuit diagram:
The two capacitors are optional but recommended. The 1.0 µF capacitor on the +12V is helpful. What it does is provide brief energy storage for the discharge. The other capacitor will help eliminate back-fed noise to the EFI controller.
12558948 COIL
edit:
interesting testing that describe how coil performance matters:
- Description and bench-testing of LS1, LS2 (D-580) and "Yukon" (D-585) coil-near-plug GM coils.
- long testing video (check last 4 minutes ) http://video.google.com/videoplay?do...65754251&hl=en
Interesting use of capacitors in the circuit diagram:
The two capacitors are optional but recommended. The 1.0 µF capacitor on the +12V is helpful. What it does is provide brief energy storage for the discharge. The other capacitor will help eliminate back-fed noise to the EFI controller.


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