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Dual four-barrel carburetors, mounted in tandem and connected by delayed-action linkage, are optional equipment with the V-8 engine.
Throttle linkage is designed to control only the primary side of the rear carburetor under road load conditions and both carburetors under full load. Weighted auxiliary secondary valves, on either carburetor, are mounted above the secondary throttle valves and do not open until air velocity is high enough to offset the weight. This eliminates "stumble" on immediate full throttle and make s possible smoother, more positive secondary control.
For improved acceleration and engine performance, the smaller diameter venturis are relocated to the primary side of the carburetor and the larger diameter venturis to the secondary side. A vented balance tube crossing over the primary and secondary side of either carburetor prevents fuel spillage on fast turns.
A choke is provided on the primary side of the rear carburetor only. To ensure faster cold engine starting, secondary throttle valves of the rear carburetor remain closed during choke operation by means of a lockout device in the carburetor linkage.
Or maybe the Corvette 1997-2002 C5 5.7L Parts Manual?