Abstract: An oil pump for an internal combustion engine includes an annular boss on a front cover of the engine, a counterbore in the front cover behind the boss, crankshaft driven oil pump elements in the counterbore, and a planar closure plate attached to the front cover over the counterbore and capturing the pump elements. The closure plate has a pair of raised protuberances thereon which span the chain drive chamber of the engine behind the front cover and which straddle the chain within the chamber, each of the protuberances having a flat wall around respective ones of a pair of ports in the closure plate. One of the ports is connected to the pump intake and the other is connected to the pump discharge. A pair of face seal assemblies on the cylinder block of the engine around low and high pressure galleries engage the flat walls of the protuberances when the front cover is installed on the cylinder block and define fluid seals around the ports.