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Old June 13th, 2009, 08:57 AM   #1
chevota02
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Timming off

I was wondering if a chevy 400 will even run if the timming is off more than 30 degrees?? I don't think so what do you think??
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Old June 13th, 2009, 09:11 AM   #2
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Depends if it's advanced or retarded. Way advanced should make the idle high and retarded should kill it.
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Old June 13th, 2009, 07:21 PM   #3
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30 degrees advanced it will probably ping like hell even at idle.
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Old June 13th, 2009, 07:28 PM   #4
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I had a truck in at work a few months ago that the customer needed tuned. It idled at approx 1800 but didn't knock, rattle or anything. Found the timing around 50' at idle. Reset that to 12-15' and dialed in the carb and checked the timing again. When I was done, it idled at 750 and ran like a watch.

Of course, every engine will act different in some degree.
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Old June 13th, 2009, 08:24 PM   #5
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if you stop and think about how chevys are set up the standard distributors have 37* of advance. so if you tune it badly the distributor can actually help take some off the top. if the advance is really retarded the exhaust would get really hot and that makes for a new set of problems like burned valves. the vacuum advance id divided with the mechanical advance which only has 15*-18* total. so if its spinning 1800 and the timming light is showing 30* its about right.
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