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.