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I made the switch to the AVS2 800 from the Performer 750.
For my application, 472 Hemi single 4 bbl it is a much smoother idle to off idle transition.
No more annoying surge. Gone with the new AVS2 800.
I would have the surge off idle with the 750 and running at rpm lower than 2000. I played with the jetting and step-up rods to no avail
Worked for me.
on all six cars 440 mopars and 425 buicks skylarks all kinds of intakes 7 different ones and about 10 different cams. some times if the stars all in line they would perform good, you forgot ignition timings which i also mess with. it also showed on the dyno where they go lean then get richer.
i did say 440 engines and i never asked a question i was just saying what happen with me. i was keeping it basic i had to many combination over my 47 years to list. am sure the 750 would be more suited to a basic stock engine.
The annular booster design of the AVS2 cures many ills, as documented by the OP. The AB atomises fuel better, helping response. The ABs also take up more space, increasing velocity for more sensitive mixture control.