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Old 06-24-2008, 04:38 AM
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timing and advance

waht is a good place to set the timing on my 454 11.75 650 lift cam
and high output ignition with hei dist
and also do i need to use the vacuum advance
i thought it was only for idle

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Old 06-25-2008, 09:36 PM
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Hook your advance up to manifold vacuum, adjust your idle speed back down, Turn your distributor counter clockwise(advance) until you get to your maximum vacuum. Now turn it clockwise(retard) 2"'s of vacuum. Re-adjust your idle speed, and mixture screws.

Now rev it up to over 3000 rpm, or above it's maximum advance, centrifugal and vacuum advance, at this point you should be some where between 34 and 38 degrees. I like to set them @ 38 degrees total. Re-adjust your idle speed and mixture screws. This will very with the CR and cam timing, but it will get you close.
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Old 06-27-2008, 01:40 AM
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Vacuum advance makes for a cooler- & smoother-running, more economical engine at idle and part-throttle. It has no effect when the throttle's wide open.
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