How do you remove cilinderheads from Cadillac srx 4.6 north star without taking out engine?

To remove the cylinder heads from a Cadillac SRX with a 4.6L Northstar engine without removing the engine, first disconnect the battery and drain the coolant. Then, remove the intake manifold, exhaust manifolds, and any associated components, including the valve covers and timing cover. Carefully unbolt the cylinder heads, ensuring to follow a proper sequence to avoid warping. Finally, lift the heads off the engine block while ensuring all bolts and components are clear.