Originally Posted by bowhay
ok well thats good but now that its done with
back to the problem at hand
and rochester q-jets they are vacume secondary, there is a lil rod that connects the vacume pump on the carb to the back barrels, and it is how u control when the barrels open
maybe iti got bent a lil more than it should be
idk just an idea
it happened to mine before i went holley
Bowhay, actually there is a adjustment on a spring that controls the opening rate of the air valves ( the top set of butterflies) the bottom butterflies are mechanical, just like a holley double pumper, but the top set of butterflies (the air valves) control how much air that goes into the secondaries and how fast, its a bitch to set the spring properly trust me - you just have to play with it.
Too tight and they take to long to open up causing poor performance, too loose and they open to fast causing a bad bog but then takes off, sounds like yours are to loose.
And that pull off is associated with the choke, its needs full manifold vacuum on that hose, it disables the rear air valves till the choke has fully opened, if its not working or has a leak, the air valves may not open at all or open when the engine to cold to handle that volume of air.
Goodluck, Cp