Break-In. How Long?

best advice i ever got was from Terry Zeke Maxwell he built my 440 and told me once cam was broken in try to kill it , beat it from day one and drove that truck for 700,000 miles over 13 years never had a problem with the engine . Do the same with all my cars either they last or they don't
Pat Musi says the same thing. Break the rings in on the first burnout. Then run it like it owes you money.