This is for a low deck BBC dart block.
Here's the specs
Roller cam bearings
Bronze lifter bushings
Billet main caps
This block will need at least a touch up hone if you want me to do it I can put it to a specific size up to an additional .005 for 200 more or 300 more if you want more than .005 removed. It would be done on a Sunnen diamond hone.