The Edelbrock #60825 Performer RPM cylinder head is designed for 1961-79 Chrysler 361-440 c.i.d. Wedge engine applications. The Edelbrock #60825 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. They also feature the highest quality intake and exhaust valves and valve springs. For use on pre-pollution controlled vehicles only. EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC ROLLER CAMSHAFT APPLICATIONS Max valve lift .600″. Intake valve diameter 2.140″/Exhaust diameter valve 1.810″/ Chamber Volume 75cc/ Int runner volume 210cc. Special order item 5-7 business days. Please e-mail with questions.