set back blower vs gating a regular intake

I assume we are talking about a high helix Rootes blower. The answer is NO. The problem is that air is coming out of that blower at about a 45* angle and is shooting into the forward part of the manifold. It has a real hard time turning 180* so really what it is doing is filling up the front of the manifold and working its way back. If you set the blower back then you can get more room to turn hat air around and get more CFM flow. The ultimate solution is to get a set back manifold that has indvidual runners to each cylinder. Remember you are balancing the port nozzle to match the air flow so if you have tons of fuel going into the forward nozzles and less going intyo the back nozzles then your forward cylinders are makinga lot more power than your back cylinders. If you move that blower back and balance out the cylinders then you make more even power on the motor.

 

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No because with a setback blower the air can now go to the sides easier and not stuck in that small box in the manifold where the burst panel is. It is pretty hard for the air coming out of the blower at that steep angle to turn 180* and go back the other way smoothly. This is going to create a lot of turbelunce and reduce CFM. With a standard placement of the blower we all know that normally the front two cylinders get more air than the others because they are forward and first inline. If you move the blower back then that air has a better chance to spill over into other cylinders.

What you are saying about the boost level may be correct. Boost is a measurement of air NOT put into the cylinders. So if you can distribute more air into the other cylinders then I would think that boost would decrease and CFM would increase. The problem is where you measure the reference boost pressure. If you take it off the back of the manifold then it would seem that boost would go up as you moved the blower back. If you measured it at the front of the manifold then it seems like boost should go down as you move the blower back. On the Culvers PM I measured boost in each of the intake runners from a fitting next to each nozzle so I could see the actually boost the cylindres were seeing. We built our own data recorder to do this.