The 2x4bbl induction systems do not produce as much power or mileage as a 6-pack system. Not on a 440 anyway.
I got my 6-pack modified by "Six Packs to Go" or whatever they were called. This makes the secondaries fully manual. Normally this would kill the carbs performance but the modification also adds acceleration pumps and squirters to the outer carbs. So they behave like the secondaries on a 850dp carb. Except of course a 6-pack flows equivalent to a 964cfm Holley.
My engine makes well over 500hp. Maybe as much as 540hp. Yet I get 13mpg (15.6 US Gallons) out of it on the highways. This is mainly due to the very small size of the primary (centre) throttle blades. And the GV unit.
The whole induction makes very good power up to 6500rpm yet because of the dual plane design remains good at low speeds too. Throttle response is amazing. Like a wild animal with no lag at all.
Worth considering if you ever want to add something a bit more interesting to your car next time you get bored.
If they are still in business of course.
