Strength of Stock Push Rods

I've ran a .533 hydraulic cam in both a 360 and a 440 with stock rockers. The 360 had OOTB Edelbrock heads and the 440 had OOTB 440 stealth heads. Ran each for several years in my race car. Shifted at 6000, went thru the traps 6200-6400 and never had an issue.