Idle Air Control Valve - IAC allowing it to run cooler

allowing it to run cooler and quieter than external units

Their strong die-cast aluminum design ensures an excellent gasket seal and dissipates heat better than many other covers

The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine

They also offer the potential for improved fuel economy by making the engine more efficient

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

Idle Air Control Valve - IAC allowing it to run coolerThe automobile engine is a perfect balance of science and mechanical engineering. Each part is designed to interact with the other in perfect harmony to produce a means of transportation. One very small, but very vital component found in this mass orchestra of mechanics is the idle air control valve, or better known to mechanics as the IAC. Speedmaster offers their version, the IAC valves adjust the airflow to improve motor idling