Because of the TB mounting surface the bore diameter is limited and you an imagine the monoblade having a larger surface (flow) area than the double blade TB.
the reason G.M. chose 2 side-by-side throttle blade throttle bodys was simply a matter of hood clearance , if you look closely at the IAC valve manifold and throttle body coolent heater assembly it is fairly close to the manifold water neck so the lower edge dimension is fairly well set, to get the same air flow potential as the stock twin 48mm throttle bodys a single ROUND blade would need to be 68 mm now that would raise the upper edge of the throttle body about .8 inches and as you may know theres only about .6 inches above the throttle body to the hood clearance now in a vette, and some camaros and since they used the TPI system in both cars...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.