Overview

The Indmar 8.1L HO is the most powerful engine in the big block inboard category for 2007. Its 496 cubic inches crank out monster torque, as well as horses in the hundreds. Little wonder it has proven itself the worthy replacement for older GM powerhouses like the 454 and 502.

Standard equipment for the 2007 Indmar 8.1L HO is Indmar's ETC system (Electronic Throttle Control with Cruise). The Indmar developed system allows the helm throttle control to electronically connect to the engine's ECM. Throttle response is quick and smooth. The Electronic Throttle Control with Cruise feature is a bonus to recreational water-ski and wakeboard families.

High-tech engineering features have enhanced the engine's smooth power delivery, fuel efficiency and long-term durability.

The 9.1:1 high-compression Vortec heads with their straight-flowing matched port design help the engine run both smoother and cleaner while delivering big-time power. The Vortec heads produce more usable power from every fuel charge.

The MPFI aluminum intake manifold improves cylinder-to-cylinder airflow distribution to achieve cleaner, more dependable combustion. Tuned runners enhance the already monster low-end torque, while delivering awesome power to top-end, too. It's brain is Delphi's most advanced water resistant ECM (Electronic Control Module) the MEFI-5 hardware/software system. The MEFI-5 system is custom calibrated by Indmar to provide maximum performance and drive ability. By custom calibrating the ECM to match hull design requirements and the intended boat application this process allows boat and motor to perform as one seamless unit. The three-dimensional system precisely manages fuel, ignition and air. It is programmed to deliver the power skiers' and wake boarders' need, plus the classic turnkey starts, unhesitating dependability and fuel efficiency that only Indmar can deliver.

The coil-near-plug ignition system is computer controlled and works without a distributor. It zaps out 25K per cylinder via long lasting platinum tip plugs for an ultra-powerful burn.

The Indmar 8.1L HO is backed by Indmar's 3-year limited warranty and customer service.

Certified: Three Stars Ultra-Low Emission by California Air Resources Board 2007.

General Specs

Displacement: 8.1L / 496 CID
Cylinders: V-8
Heads: Cast Iron (High-flow Vortec heads)
Block: Cast Iron
Bore & Stroke: 4.25 x 4.37
Compression Ratio: 9.1:1
Exhaust: 2 Piece Designed Manifold.
Fuel System: Multi-port EFI (High-torque, dual flow design)
ECM: Delphi MEFI-5 hardware/software system that is custom calibrated by Indmar.
Ignition: Coil-near-plug ignition (One 25K coil per cylinder)
Fuel Required: 89-octane minimum
Oil Type: Pennzoil Marine (SAE Heavy Duty 40W)
Oil Capacity: 10 quarts with filter
Oil Filter: Pennzoil PZ3
Spark Pugs: 41-983 (Platinum Tip)
Max RPM: 5400
Warranty: Factory-Backed 3 year limited warranty including fuel and electrical.
High Out-put 90 Amp Alternator light systems: Produces 40 amps at idle.
Heavy-Duty Sealed Wiring Harness:
High-Flow Vortec Heads In A Big-Block Engine:
Coil Near Plug Ignition:
Advanced Valve Train: Steel camshaft with marine-specific performance profile increases low-end torque for hole-shots, while lengthening the flat torque curve for excellent top end power.
Serpentine Alternator & Circ. Pump Belt:
Marine-Specific Circulating Water Pump Impeller:
Exclusive Multi-step Paint Process: To give maximum protection from rust and corrosion.
High-Torque Marine Camshaft: With hydraulic roller lifters delivering maximum performance.
Beltless, Crankshaft Driven Seawater Pump: Works better and lasts longer.