Mercury - Quicksilver Exhaust Manifold Port or Starboard For MerCruiser V8 Engines 807078T08. Overview. When it comes to keeping your MerCruiser running cool and breathing efficiently, the Mercury Marine 807078T08 Quicksilver Exhaust Manifold is built to deliver factory performance and reliability. Designed for use on either the port or starboard side of V8 MerCruiser engines made by General Motors, it fits 454 and 502 CID models from 1981 to 2002. With an included gasket and corrosion-resistant