Normally the assist is there. Sometimes the problem is the engine you couldn't quit building. Big cams with big lift can cause real low vacuum situations at idle and low rpm, especially with Ford ...

In this video, I demonstrate how to create a budget-friendly vacuum chamber using a refrigerator compressor and a steel pot, ideal for projects like degassing resin, plaster, silicone, wax, and wood ...

In the quest for that "rumpity-rump" sound, and all the performance that goes with it, your engine will more than likely lose the consistent flow of vacuum needed to aid your foot when the time comes ...