Edelbrock Cylinder Head Perf RPM BBC Rect Port NHRA Legal Bare

Edelbrock is well-known for making performance parts that help engines run better, and their Performer RPM cylinder heads are a prime example. These bare heads are specifically made for Big-Block Chevy engines and are NHRA legal for Stock/Super Stock classes. They're designed to give you a noticeable boost in throttle response and power across a wide operating range, from about 1500 all the way up to 6500 rpm.

What sets these heads apart is how they're built. Edelbrock casts and heat-treats them in their own foundry and then machines them right here in the USA, ensuring top-notch quality. They use advanced computer technology to design highly efficient ports and combustion chambers, which translates to improved performance and that eager throttle feel you want. You'll find solid features like threaded inserts in the rocker stud and exhaust bolt holes for extra strength, plus manganese-bronze valve guides and ductile iron valve seats – details that make a real difference in durability and performance over the long haul.

These heads feature smaller-than-stock 11/32 inch valve stems, which are a key part of their design for promoting excellent airflow. Since these are bare heads, you'll need to source your own valves, springs, retainers, and other valvetrain components to complete the assembly. They are designed for Big-Block Chevy Mark IV engines, including displacements from 396 up to 502 cubic inches.