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What is a 330545 Chevy head casting?

A 330545 Chevy head casting number refers to a cylinder head used on small-block Chevrolet V8 engines. It's specifically a casting from the 1970-1972 model years. These heads are known for having relatively small valves and chambers, making them suitable for lower RPM applications and generally not ideal for high-performance modifications. They're often considered a "stock replacement" type of head.