Jethrow Engines LLC provides high-performance engines for airboats and recreational boats, serving the experimental marine markets worldwide. We source brand new parts from OEM suppliers and assemble the complete engines in North Carolina, USA. Each engine is thoroughly test-run before shipment. For a small additional fee, we can also test and balance the engine with your specific setup to ensure it works perfectly with your boat or airboat.

Why Jethrow Engines?

For boat owners looking to upgrade from a standard 4.3 Mercruiser engine, which typically delivers around 215 HP, Jethrow offers a powerful alternative. Our 4.3 engine produces 375 HP and fits in the same space, providing a significant performance boost without requiring extensive modifications.

Non-Turbo Version

Our non-turbo engines are only slightly heavier than most four-cylinder marine engines and significantly lighter than most six-cylinder engines. This means you get more power without the added weight, resulting in better fuel efficiency and improved handling for your boat. Includes everything, including the ECU. It’s a drop-in replacement with minor modifications to the engine mounts and connection to your existing drive. You can upgrade to a Bravo 3 drive (using the same Bravo transom mounts and hookups) or replace your Bravo drive in a year or two when it wears out due to the added horsepower and speed from the new engine.

Turbo Version

For those with boats or airboats with extra space, we offer a turbo version that can produce up to 600 HP with 10 lbs of boost, providing exceptional power and performance. Our turbo version is about 50-100 lbs lighter than comparable turbo 6 cylinder engines - but we have more HP using modern tech with less weight, in the same space, with more reliability.

Ordering

At this time we are taking $5000 deposits via PayPal, credit card or check (Jethrow Engines LLC) for delivery in about 90-120 days. Deposits are fully refundable for 15 days. The no questions asked spousal money back guarantee promise. 🙂