The Edelbrock #60549 Performer RPM Bare Rectangle Port cylinder heads are designed for BB Chevy applications. The #60547 Performer RPM heads are perfect for street performance, daily drivers and muscle cars where more performance is needed.
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The Edelbrock #60549 Performer RPM Bare Rectangle Port cylinder head is designed for Big-Block Chevy applications. The Edelbrock #60547 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.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.
Bare heads will have valve guides & seats installed, but will require final sizing & a valve job to match the valves you will be using.; Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.; All Performer and Performer RPM Big-Block Chevy heads: Spark plug is closer to center of bore, will interfere with high-dome pistons for open chamber heads.; Use pistons designed for our heads. Match with Edelbrock head gasket sets.; Designed for street/high-performance big-blocks operating from 2500-7000 rpm; Specially designed ports for increased flow and velocity over standard big-block cylinder heads; Highly-efficient 118cc open-style combustion chamber; High-velocity 315cc long/300cc short intake ports; Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight