Mercury - Quicksilver Exhaust Manifold Port or Starboard For MerCruiser V8 Engines 807078T10. Overview. When it's time to replace a worn or corroded exhaust manifold, trust the Mercury Marine 807078T10 Quicksilver Exhaust Manifold to restore factory-grade performance and reliability. Built for V8 MerCruiser engines made by General Motors, this manifold fits 454 and 502 CID models (1981-2002) and can be installed on either the port or starboard side. Designed for both freshwater and saltwater env