I can't comment on Pontiacs with EFI, but I can on BMW and Porsche.
The shop I work for has taken a number of the BMW 'M' 4-Valve Six-Cylinders and converted them to Weber carburetors.
The difference in power output is unreal. The EFI doesn't even come close.
There is a reduction in smoothness at part throttle and the engine is obviously more tempermental when cold, but HP and TQ are higher than even the motors with upgraded throttle bodies, injectors and ECU upgrades.
Years ago, I also recall the Rochester Fuel Injected Corvette (375 HP) produced much less HP and TQ on the dyno than the carbureted (365 HP) version of the venerable 327.
Obviously, EFI is all-around the best choice for driveability and economy, but I see some serious limits to its airflow potential in most applications.
Additionally, when speaking of EFI on a Pontiac, most systems I have seen will not allow use of stock A/C.
Why not just adapt the Tune Port Assembly from a SBC for use on the Pontiac? The port arrangement is similar and I am sure the angularity of the cylinder deck could be compensated for with a properly fabricated intake manifold.
I personally, would like to see a 4V TBI Unit that would bolt on in place of the stock Q-Jet and allow use of stock A/C and Alternator Brackets.
Just curious...Robert
"If I had better junk in my garage, I know I could go faster."
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