Spark control vent is just a vent, I believe it was vented to the top of the carb to ensure it wasn't open to elements. If not mistaken 71 and up has a small foam filter in the end of the solenoid VS the hose to the carb.
The vacuum break on the 71 kicks the throttle blades slightly open in 3rd and 4th in a coasting scenario and also limits full vacuum to the distributor after temp is up.
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~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
#21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built.
71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
NUMEROUS Lemans blue Camaros,
Monza Red and Daytona Yellow Corvettes
& a Chevelle or two...
Survivors, restored cars, & other photos
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