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GM 454 (1988). There is a timing scale ounted on the timing chain cover toward the bottom. Using the bottom timing scale and spark plug no 1 does not work. So what is the spark plug to use and how many degrees BTDC should I adjust the 454?
with the vacuum disconnected and the engine warm, put the timing lite pickup on the #8 spark plug wire. The bottom timing pointer is 90* off the top pointer. Advance wants to be set at about 4*. then hook up the vacuum advance and check it again to make sure the advance works. |
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