I believe Norris stainless steel rockers were investment cast.
That's also known as "lost wax casting".\
Strength depends on the material. If one is comparing cast iron to forged steel the answer is obvious. However, if one is comparing a forging or billet piece of say 17-4 ph to an investment casting of the same material it would surprise you how close the strengths are.
One reason investment casting is mentioned at all is that it provides a near net shape with little machining required. Thus the investment cast rocker might cost quite a bit less.
https://www.milwaukeeprec.com/investment-casting-benefits.htmlR.
