Who offers NHRA-accepted cylinder heads? Engine legend Edelbrock, of course! And their Performer RPM bare heads are ready to help you generate winning Stock and Super Stock results. Made in the USA, these heads are designed by skilled Edelbrock engineers—using the latest computer technology to yield great throttle response and top-end horsepower. Highly efficient ports and state-of-the-art combustion chamber shapes are cast and heat-treated, and then machined to deliver the best in quality and performance. Each unit has rocker stud and exhaust bolt hole threaded inserts, as well as manganese-bronze valve guides—and they're easily identified by the engraved NHRA oval logo on both ends. Not just any company can produce NHRA-accepted quality heads. Get legal to run with Edelbrock Performer RPM Stock/Super Stock cylinder heads.