Piston Pin Material - Unexpected

Makes sense. Chevy tends to use cheaper materials and wall thicknesses, usually just barely on the safe side of what's needed for an application. Chrysler was always over-engineering driveline parts, especially in the '50s and '60s. If you want to see something even more over-engineered than Chrysler, look at the nickel content of AMC blocks - it wrecks tooling if the machinist isn't careful.