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Originally Posted by j.fro
Heat them till they're red hot before trying to loosen them. And ditto on using an impact wrench.
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Using an impact is a great way to ensure you break them off. Impact socket? Sure, or any other good socket, but no to an impact wrench. Penetrating oil is your friend here. If you choose to use heat, you want to heat the aluminum head, NOT the bolt. The idea is to get the material around the fastener to expand, making for a "looser" fit. If you heat the bolt, you accomplish the exact opposite, which is not what you want. Warming the engine to operating temp can often help, as the aluminum expands more than the steel bolt anyway.