How is a hydroformed head different from a cold formed or bumped head?

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How is a hydroformed head different from a cold formed or bumped head?

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The dish of a hydroformed head is inflated and formed using high-pressure water or compressed air. Cold formed heads are shaped by forming a flat plate into a dish by making small bumps via many passes over the entire head. For more information, please see our bulletin, Head Forming Processes and Comparisons.

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