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Old 09-06-2016, 03:19 AM   #15
toolboxchev
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Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
Re: Idle vacuum - why only 10 inches?

Try bumping up your timing to 14 initial. I just did my 350 after being stubborn for years and setting at 10 btdc. Now my motor purrs like a kitten, and I have more vacuum on a 100k bottem end. Also a noticeable increase in throttle response and mileage. It had to be repeated to me multiple times that cheap S*** ethanol needs the timing more than the real stuff.

Vacuum is at 20, now when warm. about 15 cold., sticking fricken valves. 100 k on the bottom end.

I have an Eddy carb and they are extremely easy to balance out with the vac gauge.
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