Throttle Body Comparison
Edelbrock E-Force (85mm) vs. Ford Mustang GT twin (55mm) and GT 500 twin (62mm)
Stock twin 55mm bore with 10mm shaft = 5.66 sq. in. total area
GT500 twin 60mm bore with 10mm shaft = 6.91 sq. in. total area
Edelbrock single 85mm bore with 8.8mm shaft = 7.64 sq. In. total area
In addition, area being equal, a single bore will always flow better than a twin bore because there is less bounding surface area to interrupt the flow. Also, both the stock GT throttle body and the GT500 throttle body have an as cast surface leading into the bores, where the Edelbrock unit is machined through for less wall friction. Last, the inlet is port matched to the throttle body for a perfect matching transition.