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Due to their unique valve positioning, Ford Hemi heads require different pistons than a standard 429/460 big-block. As hard as it may be to believe, however, the Diamond pistons aren’t custom one-offs. TME has worked closely with Diamond over the years, and the company now offers off-the-shelf pistons that perfectly match up with the chambers on the TME heads. All Boss heads retain the same bolt pattern as a standard 385 series big-block.