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I think I phrased that poorly. I didn't mean to imply the timing of the spark was changing. I meant timing in the broader sense. The valves are opening and closing at a different time in relation to the spark.

I hadn't considered hydraulic. That may be what he meant. I have a slant and, yes, the FSM instructs you to adjust the valves hot and running. That may have been what caught my eye initially. If you alter the lash, the overlap will change, but the amount of vacuum will also depend on the timing...

Thanks for all the input. So's you don't think I'm making this up, I read it in this ancient thread: http://www.moparchat.com/forums/archive/index.php?t-668.html "Ive even used a vac. gauge to adjust my valves while the engine is running ,I adj. to max vac. at idle if i want more torque," (Does...

I was trying to educate myself on ignition curves and read of someone who swore by this. He sets valve clearance (engine running) to the highest vacuum and then measures what worked for future reference. Does anyone out there do this? Is there a reason to or not to? D