Can you use a car engine in a pontoon boat?

Yes, you can use a car engine in a pontoon boat, but it requires significant modifications and considerations. Car engines are not designed for marine use, so you would need to adapt the cooling system, exhaust, and fuel systems to suit a marine environment. Additionally, the engine must be properly mounted and aligned to ensure safety and performance on the water. It's often more practical to use a dedicated marine engine designed for boating.