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Please confirm i am correct on timing.

438 Views 0 Replies 1 Participant Last post by  seville1991, 
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As some of you know I have an 89 deville I am trying to hunt down a problem. The timing was set at 12. I have it at 10 right now. On the 89 4.5 engine, is it correct that if you are not using premium gas, that the timing should be set to 6?
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