8.1S Horizon (370-hp)
This is the big-gun in the MerCruiser line of recreational powerplants. It's designed to put real performance into mid-size express cruisers.

Fast Facts

Propshaft HP	370-hp
Configuration	Big Block V-8
Displacement	8.1 L /496 CID
Bore & Stroke	4.25 x 4.38 in. (108mm x 111mm)
Fuel System	Sequential Multi-point Electronic Fuel Injection
Base Engine Weight	1,130 lbs
Length/Width/Height	47x33x24 in.
Max RPM@WOT	4200-4600 rpm
Warranty	3 Years

Key Features

• Mercury-exclusive PCM 555 high-speed microprocessor that optimizes fuel mixture, knock control and ignition timing independently for each cylinder, resulting in improved, precise performance. PCM 555
• Distributorless ignition system that improves timing accuracy and eliminates mechanical timing adjustments.
• Closed cooling with 5-year coolant.
• Redesigned exhaust system with aluminum manifolds and stainless steel elbows that is 65 percent lighter and more corrosion-resistant.
• Exclusive Engine Guardian protection senses potential problems and virtually eliminates the chance for engine damage due to overheating, low oil pressure, or low drive lube
• Long individual runner intake manifold design provides optimum torque and horsepower for demanding marine applications
• Sequential fuel and spark control maximizes performance from every engine cylinder
• Convenient remote oil filter location makes oil changes cleaner and makes periodic service simple and less work
• Cartridge-type water-separating fuel filter helps protect fuel system and engine against damage