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I have personally owned one of these trucks and to tell you how to time it is pretty simple. There is a black box located on the passenger side firewall remove it and there is a single wire (i think it is tan and black) unplug it and set your timing to top dead center with a timing light. As for the cylinder and distributor cap timing you can get that from your local auto parts store, I know that they have it because i work at auto zone they can definitely print you a copy free of charge.

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12y ago
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Q: What is the correct timing for a 1990 Chevrolet Silverado truck with a 5.7 liter engine?
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