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Fuel rail stock works perfect for a vacuum block. One end goes to the booster, one goes to the valve cover, then the 6 small ports like you are doing. Curious to see if you have more luck with the speed density tuning than I did. I didn't like the narrow resolution of 70-100kpa in the load maps. i never tried using any kind of buffer in the lines, but have read that's what people are doing. Reading off the vacuum block with a mechanical vac gauge the needle would bounce back and forth from 0-9" of vacuum. A traditional single TB will read close to 20".
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