Indmar 5.7L Vortec Operator's Manual page 25

Break-in Steps
1. For the first hour, do not exceed 2000 RPM; vary
RPM continuously.
2. For the second hour, do not exceed 3000 RPM; vary
the RPM regularly.
3. For the next five hours, do not exceed 4000 RPM;
vary the RPM regularly.
After the first ten hours but before 20 hours of operation,
take your boat to the dealer for its first engine and trans-
mission oil and filter change and engine checkup. Your
Indmar dealer is best equipped to check the engine
immediately after break-in.
After the break-in procedure is over, your boat may be
operated at any speed. Be sure to check the wide open
throttle operating range; refer to Chapter 4, Selecting A
Propeller.
Do not exceed maximum RPM recommended
for your engine. Exceeding the maximum
RPM may result in damage to the engine.
Indmar Marine Engines 1-5