there are way too ,any variables to answer your question. It depends on the boat, the boat size, weight, kind of prop and pitch etc.
speed boat
Mercruiser 260hp 350GM engine
on a speed boat to stop it from you coat it with oil i thimk
A boat with a gasoline inboard engine
Get a bigger engine. Or keep current engine and reduce drag
Idle speed in a boat typically ranges from 600 to 1,200 RPM, depending on the engine type and size. This speed allows the boat to move slowly without straining the engine, often used in no-wake zones or during docking. It's essential to maintain a safe and controlled speed to prevent damage to the boat and surrounding environment. Always refer to the manufacturer's specifications for the optimal idle speed for a specific vessel.
The cubic capacity of an engine and the speed of the vehicle are different things. A boat fitted with an engine would not attain the same speed as a motorcycle fitted with a similar engine.
there boats that have a engine on the back of them that causes the boat to have more speed when they accelerate
should be a 5.3L engine in a Z71, which was right around 260HP in 02
The cubic capacity of an engine and the speed of the vehicle are different things. A boat fitted with an engine would not attain the same speed as a motorcycle fitted with a similar engine.
Keep engine running idle speed
If it's an LT1, it's rated at 260HP.