CYL HEAD BBC PERF RPM OVAL PORT FOR HYD ROLLER CAM NATURAL FINISH. The Edelbrock PN: 60455 Performer RPM O-Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock PN: 60455 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. Chevrolet:Big-Block Mark IV:396 (6.6L)/402 (6.6L)/427 (7.0L)/454 (7.4L)/502 (8.2L). Huge Range of Parts In Stock. Supplying UK, Europe & USA. 100+ years of experience. Sourcing…