Mercury - Quicksilver Exhaust Manifold MerCruiser V8 Series Cast Iron 8M0185794. Overview. There's a certain comfort that settles in when you know your engine is built on parts that don't quit. That's what this Mercury Marine part brings to the table. Out on open water, whether you're cruising toward your favorite fishing spot or easing back into the slip after a long day, you want to trust every beat of your V8. This exhaust manifold delivers that steady confidence - the kind you feel in your h