The MOPAR power myth?

I have a Chevy friend that is a pretty serious racer. He can make the small blocks sing. He likes to boast about his 6" rod motors. He just about **** when I told him my 273 was a 6"+ rod motor.
Another one is “ I have 18 degree heads” .... join the party a little late boss? Chevy absolutely got a few things right. I can change a water pump in 1/4 the time on a Chevy vs a Chrysler small block. They also were late to the table on bearings in their engines too! Crazy to think about that.