Get your Mercruiser 4.3L engine running smoothly again with this Sierra replacement carburetor! It's a direct swap for OEM part 3310-864941A01 and fits 2002-2004 Mercruiser stern drives with serial numbers OM615000 through OW300012. This is a brand-new casting (not rebuilt) that meets or exceeds original specs. It comes pre-calibrated for optimal fuel efficiency and performance, with idle and mixture settings mostly preset—so installation is easier, usually just needing minor choke and idle tweaks. It's flow-tested across the throttle range. Includes a gasket (use Sierra 18-0994 if replacing). Backed by Sierra's lifetime customer satisfaction warranty. Double-check your engine serial number before ordering, and call their tech support if you're unsure. A reliable upgrade for better throttle response and reliability on the water.
