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Mod | | | Forums66 Topics128,049 Posts1,055,743 Members48,426 | | 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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For helping keep this great
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| | | Joined: May 2013 Posts: 82 Shop Shark | | Shop Shark Joined: May 2013 Posts: 82 | I have been reading how to adjust my carb and my timing using a pressure gauge. So, I thought I would give it a try today. I hooked my brand-new gauge to my windshield wiper tap on the intake manifold. This is on a stock, rebuilt 216. I expected to see somewhere between 15-20". To my surprise the gauge almost pegged at 30"!!!! Is this possible? Bad gauge? I looked and looked and looked to make sure that I was reading it right. And, yep, I am reading it correctly. It goes back to zero when I remove vacuum, and back to a steady 30" when I reconnect. What am I doing wrong?
daveboy
'52 Chevy 1/2 ton running original gear
| | | | | Joined: Feb 2011 Posts: 1,362 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 1,362 | Is the idle rpm high? If its a china made item who knows for sure.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.
As of 10-26-2022, A 55.2 Taskforce long bed now the work begins
| | | | | Joined: Feb 2000 Posts: 5,201 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,201 | The vacuum can not be higher then barometric pressure of that day. 18 - 20 for well tuned engine, 30 is a bad gauge.
Joe | | |
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