'71 Power Brake Booster Check Valve (and thermal sensor)

Wake up everybody! The large hose goes to manifold vacuum, usually a fitting behind the carburetor, The small hose goes to the Cruise Control Servo, or Speed Control Servo. That was only available on the 1975 A Bodies, so unless you've added factory CC, you don't need the small fitting. I can't believe nobody got that before now. But I guess if you've never been around C Bodies, you might not have seen where it is supposed to go.