The Edelbrock #60769 Performer RPM Bare cylinder head is designed for use with non-emission 1968-91 Chrysler 318-340-360 c.i.d. engine applications. The Edelbrock #60769 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. This cylinder head delivers great throttle response and power from 1500 to 6500 rpm. For use on pre-pollution controlled vehicles only.