Daves1940Buick56S Posted October 20, 2015 Share Posted October 20, 2015 I have a vintage vacuum gauge mounted under my dash so I can monitor engine performance. I have been noticing that under load and below about 12" of mercury that I get a steady rapid fluctuation of the needle, moving appx 2 inches plus and minus for a 4 inch total swing. I have not been able to get a video yet as it's a bit dangerous trying to shoot while driving! Any thoughts? Recall I had the head off and a valve and ring job last year. Maybe valve springs? Cheers, Dave Link to comment Share on other sites More sharing options...
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