Well if you read it on the internet then it must be true?
But as shown above here the same engine etc... has different latency's! So GM must have used this as an adjustment? Most of them are really close, say at 2000 RPM but they do move timing around a few degrees, but that same number in Usec at say 5500 RPM can be off by 11*so if you really need say 22 at a certain RPM for cruise and MPG or towing then the only way to be sure is some testing with a timing light on the balancer.
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