Another reason I prefer the FiTech throttle body over the other TBI systems is the fact that they use annular discharge. That will help keep the fuel in suspension better than injectors firing directly at the floor of the plenum.


Intake manifolds have a big impact on port injected systems. That's why the factory manifolds are so complicated. Tumble flaps, multiple port routings, and all that stuff they use helps the efficiency of the engines.

I did what I could when laying out my intake. The runner length was a toss up but I dug into plenum theories and came up with a 390 cubic inch design.

It worked for me. The hot rod was a torque monster. I'm sure someone who had access to all the fluid dynamics software would laugh at my work.