Originally Posted by FrostyKibbles
What exactly is this proficiency bolt? is it the proficiency engine, or some aftermarket special run of bolts?
The proficiency bolt is what victorys come stock with. Marqs come stock with the pillow bolt system. The proficiency bolt improves effiency and lowers your operationg pressure. The supercharger improves the bolt system even further. They did not make many proficency bolts for the marq
6 and 7 and im not sure
if they make them any more period.