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Originally Posted by DennisTA15
If the scanner reads cam to crank position or correlation then you should be good. You want that value at 0, meaning your cam is in time with your crank. This value can be + or - 2degrees, spec for the vortec motors, meaning your cam is within + or - 2degrees, at most, of your crank. With the engine running scan this and turn your distributor a little at a time until your good. If your off a lot, like 15 to 20 degrees, then you may have the distributor installed 1 tooth off.
Pauly, good link on the timing.
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I just did this yesterday, turns out I've been driving my Burban for nearly 5 years with my timing at
-6 since I had the stealership do my intake manifold reseal 2 weeks after I bought it...
It runs like a brand new one now, I had no idea what I was missing!!!
Got mine set dead on 0 now and all is well with the world, NOW my tune can actually do something!
Even my exhaust sounds totally different now!