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Can you adjust timing while it's running at idle? Advance until it no longer makes the motor "happier" then back it up a little and test it in out of gear and at low speed high vacuum driving and see how it drives. Can you log the vacuum to get a feel for how much vacuum the motor has at...

I agree you will want more timing at idle. Do you have an option to look at the chart in inches of vacuum instead of kpa? Also can you see the value kpa or in. hg. live? How much vacuum does it have at idle? Kpa and in hg.

So the top of the chart is wot. Usually what I see is whatever the motor wants at peak torque it will want the same or a little more above that rpm.. Is the timing 18 deg. at wot 6500?

I must not be reading that chart right. It looks like it's showing less timing at higher vacuum?

Google says 1 KPA = .295 In.HG

What do the numbers represent in the left vertical column?

Cool set up. I have only had 2 experiences with the mod man intake on a gen 3. One carburetor and one throttle body and both were bad. If that manifold was to work at all the set up that you have would be it's best chance. Also we dynoed a 6.1 stroker with a carburetor and found 24 degrees to...

Do you have a picture of your set up on the engine. Does this have injectors in the manifold runners?