How do you replace DOHC?

To replace a DOHC (Dual Overhead Camshaft) engine, first, ensure you have the right replacement engine that is compatible with your vehicle's make and model. Disconnect the battery, then drain the engine oil and coolant. Remove any components obstructing access to the engine, such as the exhaust system and intake manifold. Finally, unbolt the old engine from the transmission and engine mounts, and install the new engine by reversing the removal steps, ensuring all connections are secure.