1. A cylinder head that is considered "too Big" for a given street engine, that is one that would compromise the low end performance, will it have the same effects on an EFI controlled engine?

2. What are the effects of intake port velocity on EFI vs carburetor?

3. What will be the effects of polishing the intake ports on a head that is used for EFI.

All comments will be appreciated.

Squido

The benefit (or a benefit rather) of EFI is that you don't need signal across the carb to draw fuel. A combination will still be lazy with a very large runner head on a small cube engine due to air speed and poor cylinder fill, but at least the fuel supply will be predictable/repeatable.

Port velocity is probably unchanged. If you take a Victor Jr, weld in injector bungs and plop a 1000cfm throttle body on it, I don't think your port velocity will be any different than with your 1000 HP carb on the same intake. The only difference is that the air flow is "dry" in the intake until the fuel is introduced at the injector (very close to the head). Downstream from there, should pretty much be unchanged I think.

Polish, or lack of, in your runners is a matter of turbulence in the air flow and/or turning the corner in your runner. If the fuel is sufficiently atomized out of your injector then I see no difference in a polished runner from carb to EFI.

my $0.02

Thanks for your input TJ.
Squido