Watch some videos o. YouTube about “Sea Foam” for the engine (I think the name is), hey take vehicles with severe ticking, and loss of power, and run that stuff through, and the difference is amazing. Might be worth trying first. Not sure if there are any downsides to usin it though- I dont think so, but no sure.
https://m.youtube.com/watch?v=agAWXnT4-EQ&t=348s
Another on how to use it
https://m.youtube.com/watch?v=mzTdGupoew0&t=112s&pp=2AFwkAIB
Did it last? (Yep)
https://m.youtube.com/watch?v=mzTdGupoew0&t=112s&pp=2AFwkAIB
Thanks. Have heard of this but going with GM and the independent mechanic for the cam and lifters.