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we have just finished a 1996 Blazer with 4.3 vortec and found out that the electrodes under the cap do not match what the configuration on the top of the cap this could be your problem, has fixed ours hope this helps, the guys at Mid-East services Inc, waynesville office.

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Q: Why can't you set timing on 4.3 vortec. Just replaced engine and can't get it right?
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