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12-19-2003, 03:39 PM
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base timing on a 66 chevy 283
Hello I have a question about base timing for an almost stock 66 chevy 283. I changed the distibuter over to the HEI and it still has the rochester 2-jet. i've had people tell me to set it at 8 degrees BTDC. should there be more advance or less or what?
What type of vacuum advance should I be running. 
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12-19-2003, 04:14 PM
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8 to 10 is fine, but I would set it as the engine likes it, get all the advance you can, start out with 12 degree`s before top dead center, and dial in the advance curve to have a full 38 degree`s total all in by 3000 RPM, if detonation is heard, retard the timing 2 degree`s at the time until it goes away and it`s set. your vacuum advance should be connected to a ported vacuum source, or one that pulls vacuum off idle and not at idle.
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