Have you ever done an LPG grind on MACE STAGE 2 PERFORMANCE CAM & CHIP PACKAGE HOLDEN VX-VY ECOTEC L36 3.8L V6? (CCP628)

We have no, as we haven't recommended doing so (unless LPG injection setup, then fine). Depending on the LPG type, such as a mixer setup, we would recommend running higher ratio rockers instead.