The Peterson cam seal for Ford Big Block 460 (Danny-B) is a replacement cam seal specified for that Ford application. Peterson seals are intended for engines running crankcase vacuum and are designed to hold higher vacuum levels to help control crankcase pressure. That vacuum retention is beneficial for dry-sump and other vacuum-managed engine systems where steady vacuum improves oil control and reliability.
Peterson Fluid Systems Ford Big Block 460 Danny-B Cam Seal