Vacuum Heat Control Valve: Description

Vacuum Heat Control (VHC) Valves are used on all engines except 460" engines. Unit consists of a housing and butterfly exhaust valve controlled by a vacuum motor. The VHC valve is installed between exhaust pipe and exhaust manifold. The VHC valve system also incorporates a Ported Vacuum Switch (PVS) and an intake manifold vacuum tap to control VHC valve operation.