Based on performer RPM-series with unique air gap. Air gap cooler and denser mixture for more power. Designed for 1500 to 6500 RPM. Dual-plane high-rise intake. Accepts early-style waterneck only. Non-EGR. Mopar 340-360. 4 bbl carb. For street and high performance use only. Available in cast, endurashine or polished finish.