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Web the video describes the various rate secondary springs, how to change them, and the testing procedures to follow to. Web there are several reasons why your holley vacuum secondary might not be opening. Web holley vacuum secondaries won't open. Here are a few of the most. Web the video describes the various rate secondary springs, how to change them, and the testing procedures to follow to. I'm troubleshooting a 600 cfm remanufactured holley with vacuum.