First my set up. 70 Camaro, 5 speed, 3.08. 350, 9.8:1, 186 heads, 1.94/1.50 valves, open plenum intake(holley street master), tri-y headers, isky cam 224/224, 480/480 with 1.6 rockers. 12 in vacume. Live in Denver over 5000 feet elevation.
17080260 olds Q-jet, sec modified to open fully(they were restricted to 60% or so)
Carb set up 75/50m Prim jet/rod, M hanger w/cv rods,
Idle down tube .035, I moved the IAB to the airhorn(i know you dont like this).041, Idle restriction .052.
air bypass .082(added to the base plate)
Idle discharge .0935
This carb was a huge improvement over my other q-jet. Drivability is much improved, BUT, The idle screws are only 1/2 turn out. What can I change in the idle system that will allow me a little more control?? Is the IAB to small. The throttle blades are only 1 turn of the screw in from seated.
Would like a suggestion on the idle system and maybe an explanation as to why you think GM changed from the direct to the indirect IAB.
Thanks for your time.
Monte