The Top Street 72870 Alu Roller Rocker Arms are designed for LS1, LS2, and LS6 engines with a 1.7 ratio needle bearing tip, providing enhanced performance and efficiency. Manufactured by Top Street Performance, these roller rocker arms offer a durable and reliable option for improving the valvetrain system of your vehicle. With a focus on quality and precision, these components are a great addition to any engine for improved functionality and increased power output.