i'm having a difficult time locating an engine kit for an 04, is there any options other than a $3000 cummins kit? also does anyone know what oversize pistons are avaliable?

 

One of the better resources for genuine Cummins parts is Mumau Diesel. They have excellent customer service and will take the time to help. It will be hard to beat their prices. .020 and .040 are your oversized choices in factory pistons.