graves smog block off plates

Description

Graves Motorsports Smog Block Off Plates are designed to seal off the ports on the valve cover used by the air injection system (AKA smog pumps or AIS). Once these are capped off, the air injection system can be safely removed. Made from machined aluminum. Sold in pairs (except where noted). The air induction system (AIS) burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port, reducing the emission of hydrocarbons. Once these are capped off, the air injection system can be safely removed. These Smog Block Off Plates are …