I went to the dealership today to buy a new piston and was asked if it was--- full floating or fixed--- and --- with or without skirt coating and what weight.
Does anybody know the years for these specs or where could I find out?

 

The LQ9 6.0L was the first to have the coated pistons and floating wrist pins. I think in the LQ4 was supposed to get a revised setup last year, but don't know for a fact that it happened or not. If you have a 99-02 LQ4 6L, its very likely that you have the traditional pressed fit wrist pins.

 

Are 6.0 and 5.3 injectors the same size?