Rocker Arm Oiling

The Rocker Arm in question is non-roller purchased recently from RAS. I plan on calling Gary at RAS in the morning in the continuing seach for the answer. The short block is NEW, not recon. All oil passages have be checked, all clear. Was the reduced shank rear bolt for hydraulic lifter motors? Clifford sent me one, but old motor did not use this style of bolt???