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Round shape, flywheel mount.

Put every foot-pound from your 8.1-liter Mercury MerCruiser right where it belongs—the prop shaft—with the Engine Coupler 98-8M0108208. Purpose-built for MCM 496 Mag and 496 HO sterndrives, this round, flywheel-mount coupler forms the silent link between your big-block V-8 and the Bravo drive, soaking up vibration while keeping alignment true.

Cast around a long, splined steel hub and bonded to high-durometer rubber, the assembly delivers two key advantages: it cushions hard throttle punches to protect gears, and it resists the heat that cooks lesser couplers during long cruisers or heavy-tow days. Each unit leaves the factory dynamically balanced, so you won’t chase annoying buzz at mid-range rpm.

Why it pays to swap in OEM:

• Exact spline fit—slides onto the crank without forcing; no guessing on depth.

• High-temp rubber bond absorbs torsional shock and wards off premature tearing.

• Factory-balanced hub keeps drivetrain smooth from idle to 5 200 rpm.

• Corrosion-resistant coating shields the steel core from bilge moisture and salt air.

If you’re noticing a burnt-rubber smell during hard launches—or you just want insurance before the next season—drop in this genuine Mercury coupler and keep your 496 pushing hard without the drama.