400 Emission Block off Plate:Spears Racing Smog Block Off plate is designed for Close Course Racing.
Spears Racing 400 Emission Block off Plate are designed to seal off the ports on the valve cover used by the air injection system (a.k.a smog pumps or AIS). 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 CNC’ed billet aluminum and feature the Spears Racing logo. (Stainless Steel Bolts, rubber plugs are included)