Right side secondary arm operation.
End carbs were activated by a Vacuum Control diaphragm.
This “Control” mounted to the two RH rear carb studs and provided the pulling power to open the front and rear Rochester’s.
The two end carbs each had a small throttle return spring that clipped into the base plates to assist with deceleration.
The “Automatic” return springs #7013783 were twice the size of a “Manual Shift” spring #7029689 which (helped) on this Suicide Linkage.
I’ve seen many Original Vacuum Tri-Powers converted over to the Mechanical version and these springs were never changed out, because most are unaware.
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