Quicksilver - Exhaust Manifold V8 MerCruiser Series E-Coated Cast Iron 860246Q11. Overview. If you've ever rebuilt part of a MerCruiser V8, you know the relief that comes when everything bolts together smoothly and the engine fires with that familiar, steady rumble. When replacing the manifold, you want a part that quietly does its job, season after season. This Quicksilver manifold gives you exactly that feeling - a sense of security that your engine is sealed, cooled, and breathing the way it