I don't believe they have production ones yet.. Or what they call shelf pistons.bit it's been awhile since I have talked to them. But yes they are a one off set
30 OVER WITH TOTAL SEAL RINGS .0040 VALVE RELIEFS CUT.
BRAND NEW. $2700.00 FREE SHIPPING
SOMEONE WANTED THE TRUCK MORE THAN I DID SO I SOLD IT.
TEXT 608-632-0931 IM NOT ON HERE MUCH SO TRY NOT TO PM ME.
Not sure if still available for sale but I think Empire had a 7.3 powerstroke motor complete with LBZ duramax setup all done ready to go awhile back maybe contact Chad @empire I know they have there hands in a few good running duramaxs in the sled pull scene.