...Steel-Forged Adjustable Rocker-Arm on the left and the Steel-Cast Adjustable Rocker-Arm on right. The "preferred" rocker-arm is the "Steel-Forged" for a high-performance engine exposed to revs beyond 7,200 rpm.

By the way, the cost to recondition each racing forged rocker arm is $45 USD and Mike Reed at "Electronic Chrome and Grind" is the preferred source for reconditioning these very rare racing parts, after all, "Webcam" uses them exclusively! You can reach Mike at (562) 946-6671, they are located in Southern California at 9132 Dice Road, Santa Fe Springs, CA 90670 - Here is their website: http://www.ecgrinding.com - The reconditioning procedure consist of grinding the rockers, hard-chroming and polishing to perfection, but you can talk to Mike directly about the process or if you have any further questions...