Is ProMax till around? Send it back to them or find someone else to add the port. Adding a vacuum port to the metering block shouldn't be a big deal. That may be better than putting an entirely different metering block on.
i haven't looked at the promax metering block in a while but i'm pretty sure the channel for the vacuum port nipple isn't machined in their blocks. without that channel a vacuum advance port nipple can't be installed. their metering block is more orientated toward the race crowd.
