Classes
There are two internationally recognized classes
Class A - Engines in Class A boats are restricted to either 6.7-litre (412 cubic inch) engines with cast iron blocks and heads or 6-litre (365 cubic inch) engines with aluminum heads. Both size engines are only allowed two push-rod operated valves per cylinder. Furthermore the engine must be normally aspirated, using a 4-barrel carburetor. Fuel is 100+ octane aviation fuel. Typically these engines produce up to 650 horsepower
Super boats - Engines in the super boat class have no maximum size but instead have a minimum size restriction. Normally aspirated engines must have a displacement of 6.5 liters (400 cubic inch) or while forced induction (turbocharged or supercharged) engines must be at least 3.8 liters (235 cubic inch) in displacement. These engines typically are fuel injected and run methanol fuel. The small-block engines typically produce 950+ horsepower, while the big blocks can typically produce between 1000 to 1400 horsepower.
Nitro-methane and nitrous oxide are not allowed.
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