The STANDARD IGNITION PVS102 SI Ported Vacuum Switch is engineered to regulate engine vacuum ensuring optimal performance and emissions control Designed for specific Chevrolet and GMC models from 1983 to 1990 this switch features a dual 3 16 hose connector and a 3 8 18 threaded fitting facilitating seamless integration into the vehicle s vacuum system Constructed with a combination of brass and high temperature plastic the PVS102 SI offers enhanced durability and resistance to engine heat and contaminants Its precise engineering ensures accurate vacuum regulation contributing to improved engine efficiency and compliance with environmental standards By effectively managing engine vacuum the STANDARD IGNITION PVS102 SI Ported Vacuum Switch plays a crucial role in maintaining vehicle performance and regulatory compliance