This true about isx heads?

[Brock]

Depends how you look at it. Some are saying this mechanic is horrible, but maybe he's a guy who doesn't like to half ass his work.

At that many miles, if you were to inframe.. .. there is a good possibility you would want to cut the deck as it would be uneven or warped. Well if you would need to cut the deck, it would make sense that the head gasket may not seal 100% if you just take the head off. Yes you can change the head gasket and re install the head.... but it won't be 100%

Not saying I suggest such things but could be his train of thought.