MBHD, How do you figure 24HG is really 12 inches of vacuum? 24 would be 24" of mercury. Vacuum in Inches is in reference to mercury most of the time.
Either way, I do not think his guage is reading correct at idle or boost. Most engines will not produce vacuum reading that high at idle. Iregardless his carb tune is off and needs to get under control.
Snow, You reaaly need to do tuning , one step at a time. This includes timing and carb.
My 292 has O2 readings like this. idles at 12.75, cruises at 12.5 and full boost is 11.25 or so. Timing 23-25 at idle (total) , 48 cruise, 27-28 under boost.
Your meter will read different than mine, they all do. Best tip is to add fuel at first and then lean it up slowly with tuning. Start with a stock setup, unmodified carb(PVCR). Then get started.
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com
