Oil Pump Roller Chain Kit. Hot Rods Oil Pump Chain is a replacement for the O.E.M. oil pump drive chain. Exclusive heat treatment of links creates excellent friction and impact resistance for exceptional durability and enhanced performance. Chain meets or exceeds O.E.M. specifications and tolerances.. O.E.M. replacement oil pump drive chain. Exclusive heat-treatment of links creates excellent friction and impact resistance. Meets or exceeds O.E.M. specifications and tolerances.