WHAT??!! Everyone else with a 6.2 seems to be getting 50 mpg and doing sub 10 second quarter mile sprints all while pulling a 45,000 lb trailer. LOL. Finally some honesty! Thanx Steve!
Before that even, Starting in June of 2020
https://gmauthority.com/blog/2020/09/new-service-bulletin-addresses-valve-spring-issues-in-gm-v8-engines/
https://static.nhtsa.gov/odi/tsbs/2020/MC-10181159-9999.pdf