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Anyone familiar with the 5.4 GT500 cylinder head will certainly recognize the 5.8 variety. Like the block, the 5.8 head uses the existing 5.4 casting with a few machining differences. Additionally, although the head gasket is thicker, the block deck height has been machined to match, so the 5.8 cylinder head sits in exactly the same point in space in the engine compartment as the 5.4. With no changes in the ports, that's good news for header manufacturers who can use the same exhaust on 5.4 or 5.8 GT500s.