Do I need a new head ?

[ktbtrucking]

thank you for the replay.
My bad it is a Volvo engine D13 not detroit diesel. Truck is not mine.
A friend of mine bought it from the dealer with 400k and made around 5k miles and had constant problems with DEF so he went to a shop in chicago area dropped 2k and they removed DEF.
The program they put into did not remove/disable EGR.
Secondly if someone is familiar with volvo trucks this program disabled Engine feature with the menu. Assume all engine codes were unaccesible und unvisible.
I strongly advised him to put at least pyro gauge but no luck here.

He made 130k miles and put new injectors then 20k miles further this happens.
He is gonna put reman head from the dealer and new turbo.
Asked him to get more pictures of pistons , block and so on. But he did not do it and the mechanic put already new head.
Do you have to retorque head bolts like in isx?
I assume he is a victim of bad delete , and maybe poor injector replacement, no clue here.
Hope this will help others.
Regarding the turbo it is the same holset turbo that isx has. Also he put new actuator too on turbo since he bought the truck and remember that when he bought it from the dealer actuator was silver not painted so assume it has been changed already.

Regarding recessed valve has 0 knowlege here.
Might it be caused by bad programing?
Might it be caued by bad overhead set after injector replacement.
(as I said you need to take camshft out in volvo engine not as simple as in isx)