How much of a difference would it make to open up the intake, take the 2 barrels and open them up to the next sizing of a new throttle body, i noticed i think holley does 2" so in compensation could opening the 2 holes on the intake manifold make much difference? making the bigger would i lose pressure and not enough to really vaccuum since i'm not going to have anything to really force the air in now for the more opening? since its a L03 would it make no difference since the bore sizing towards the intake outlet and the outlet to the heads are not going to be touched?

 

The Holley 2" bore TBI intake manifold will work with either the stock throttle body or a larger diameter unit. It gives you the option of running a 2" TBI unit (Holley, GM454 TBI, other aftermarket) without having to bore either the stock intake or the Edlebrock intake. It is easier to just run a carb intake with a TBI adapter plate. That way you can run whatever size TB unit you want. You won't need a larger TBI unit until you have internal mods to the engine necessitating ECM tuning.

 

oh ok, thanks!