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Mod | | | Forums66 Topics128,039 Posts1,055,473 Members48,424 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#84770 10/27/2007 2:50 AM | Joined: Feb 2000 Posts: 5,195 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,195 | My 250 with three one barrels has 19.5" @ idle. The amount of carbs should not change the vacuum. One or three, it will be the same. I would bet a stock 235 will be in the 18 to 20 range depending on the valves and ring condition. A bigger cam will lower it like Desertdog mentioned, could be as much as 2 to 3 inches lower. Timing can also raise or lower it a bit. Joe | | |
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