> what is the real difference between the side draft/down draft single
>setups? is there any real performance difference?
I had a 73 Spit with the ZS for many years but when I picked up an 80 with a
weber downdraft I was surprised by the greater performance. The side
draft is more optimized for racing and higher RPM and generally not
recommended for a street car.
>From my experience the downdraft has excellent streetability, enhanced
performance, and solid fuel economy. They are not cheap though.