hi all: as always, excellent advice on this board. tackled my exhaust manifold gasket replacement on my '74 imp today ( penetrating oil overnight worked like a charm), found the pinhole vacuum leak in the check valve on the power brake assembly ( causing the rough idle w/the a/c on)..she is running smooth now one question regarding OSAC and TIC valves..are all 3 of the ports on the TIC valves used on the 440? on mine the top port is missing( that would be the hose going from the valve to the top port of the OSAC valve. since it only supplies vacuum if coolant reaches 225 degrees ( hasn't reached it thank god) there is no telling if it works. looks like the top metal connector on the TIC valve is missing and therefore no place to connect a vacuum hose...