Here are five of the best Cummins engines for marine applications:

1. QSB6.7: The QSB6.7 is a popular engine for small to medium-sized boats. It has a displacement of 6.7 liters and is available in both inboard and sterndrive configurations. It has a reputation for reliability, fuel efficiency, and low emissions.
2. QSC8.3: The QSC8.3 is a larger engine that is often used in larger boats and yachts. It has a displacement of 8.3 liters and is available in both inboard and sterndrive configurations. It is known for its power and torque, as well as its reliability.
3. QSL9: The QSL9 is a high-performance engine that is often used in larger yachts and commercial vessels. It has a displacement of 9 liters and is available in both inboard and sterndrive configurations. It is known for its fuel efficiency, durability, and low emissions.
4. QSM11: The QSM11 is a heavy-duty engine that is often used in commercial vessels and larger yachts. It has a displacement of 11 liters and is available in both inboard and sterndrive configurations. It is known for its power, reliability, and low operating costs.
5. QSK19: The QSK19 is a high-performance engine that is often used in larger commercial vessels and superyachts. It has a displacement of 19 liters and is available in both inboard and sterndrive configurations. It is known for its power, durability, and low emissions.

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