no mods at all but thats what i thinking is head gaskets thanks for the help and looks like it will be a fun couple of days

how much time and money does that normally cost?

It depends if your heads are warped or not. Diesel dynamics quoted me 2100 if I am doing this as a preventive. So there is no question my heads are straight. If they are tweaked I am unsure of.

There are some inexpensive places to get it done. All depends what needs to be done and what parts are going back in.