What are the best clams for a clambake?

Chef's answer
The best clams for steaming like this are small quahogs (pronounced koh-hogs, also called littlenecks), or buy "steamers," which are long neck clams. Mussels and clams are both sold live, and should be stored in the refrigerator in a breathable container (not sealed in a plastic bag) until ready to cook.
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