Quicksilver - Exhaust Manifold Kit MerCruiser 120/140 Series Coated Cast Iron 860235A04. Overview. There is a certain pride that comes with keeping an older MerCruiser engine alive and running strong. You feel it when the motor settles into a steady rhythm, the kind of familiar sound that tells you the boat's ready for another long day on the water. When you're working with engines built in the eighties, every part you replace matters, and you want pieces you can trust. That is where this exhaus