Truth be told, I have not looked yet. Was thinking about getting a core motor and start rebuilding it so I had one when I needed it. Mine is pushing 200k. I was not aware there could be aan availibility problem. In fact I would be surprised if the heavier duty stuff did not superseed pre turbo motors with the only diferences being the pistons. I priced a new factory rebuilt complete drop in turn key from the stealership, no core, 13k.
Years and years ago we made stuff work. We used to build chevy 292 straight sixes and used Ford tractor rods we had reworked. I dont hear much about beefing these motors up much other than pumps, injectors and turbos. No custom cam ginds? No trick manifolds? Anybody ever play with these motor internally?