Extensive testing of intake systems was done. Eventually the team settled on diameter ram tubes each long and a central plenum. This configuration was tested against both a 1963 and 1964 turbo engine as well as engines with six individual carburetors and two three-barrel Webers. The injected engine's output of was higher than both turbos but lower than either carbureted engine. Road testing of the injected engine began on 19 April 1963.
