Your old blower probably was completely open on the bottom, not the most efficient way to move the air. The high helix blower will have a much smaller and different shaped air outlet on the bottom. That location will determine how the blower works with your manifold. There will be an imbalance between cylinders, especially with your very low profile BDS manifold. Even with my Gutsram intake I put more air and fuel into the front cylinders because the blower is set forward. That's why it's essential (in my view) to tune by port as well as by hat injectors. Talk to the manufacturer about your options and what will work best with your BDS intake. They should know and be willing to work with you on it.
Jim
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****'63 Tempest, 475" IAII, Wenzler Super Chief heads, converted to blown alcohol, Birdcatcher, Littlefield 10-71 high helix. Best pass to date: 7.67 @ 181.59 (1/4 mi.), 4.95 @ 143.67 (1/8 mi.), 1.18 (60 ft)
7.75 @ 178 pass:
https://www.youtube.com/watch?v=Iez3...ature=youtu.be
First seven second pass(7.98): https://wwwoutube.com/watch?v=DK17...ature=youtu.be
Thanks to Paul Carter @ Koerner Racing Engines
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