Actually..... it’s not a 750.
Before the “HP” carbs existed, a very popular carb in the circle track world that was sold through a bunch of different carb modifiers was to take a 750DP, cut the choke tower off, blend the top, then taper bore the bottom of the carb body from the stock 1-11/16” up to 1-3/4”, and then use an 850 baseplate on it.
The HP950 is basically an ootb version of that concept, only with an improved air entry shape.
The flow about 860.
A “750” has a 1.375” venturi/1.687” throttle bore.
The original HP950 has a 1.375”venturi/1.750” throttle bore.
