Question about 1992 GMC G2500
The correct timing would be what the sticker says. However, if there is considerable mileage on the timing chain then your timing would be off even when set with a timing light because the chain will stretch with usage. The more miles on the engine, the more stretch in the chain. To myknowledge there is no formula to determine how much extra advance to use to compensate for that stretch. Advance your timing a couple of degrees at a time until you can find a satisfactory amount of power and still have the engine start easily. If it starts to turn over hard,especially when hot you have gone too far, back your timing off a little. Or you could replace the timing chain and gears as a set. Hopethis helps.
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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