How do I make sure my mechanic diagnosed a blown head gasket correctly on my 2003 impala 3.8 with 320000 miles.

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Techsus
Techsus

Do your own test, as here. I wouldn't trust anyone's word for it. Ronald Reagan: "Trust, but verify." Techsus: "Don't trust anyone, verify EVERYTHING." Here, simple, cheap test DIY. P.S. Come back right here & let us know what you find, huh, for the Common Good?: https://www.youtube.com/watch?v=v0U8Iyf0kk4