How can i tune Suberban 1989 Timing with 454 Ci ??
I know that the timing for it in >>> 0 <<< so how can i make it 0 ?

 

Um i guess i dont understand your question. With a timing light, you just set it to zero with the car at idle warm, and engine running. You might have to pull a reference wire to the distrib to make it not adjust timing. Then you are done...